Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc-merge

arch/powerpc/Kconfig

@@ -581,17 +581,12 @@ config ARCH_FLATMEM_ENABLE
        def_bool y
        depends on PPC64 && !NUMA
 
-config ARCH_DISCONTIGMEM_ENABLE
-	def_bool y
-	depends on SMP && PPC_PSERIES
-
-config ARCH_DISCONTIGMEM_DEFAULT
+config ARCH_SPARSEMEM_ENABLE
 	def_bool y
-	depends on ARCH_DISCONTIGMEM_ENABLE
 
-config ARCH_SPARSEMEM_ENABLE
+config ARCH_SPARSEMEM_DEFAULT
 	def_bool y
-	depends on ARCH_DISCONTIGMEM_ENABLE
+	depends on SMP && PPC_PSERIES
 
 source "mm/Kconfig"
 

arch/powerpc/kernel/Makefile

@@ -12,11 +12,13 @@ CFLAGS_btext.o		+= -fPIC
 endif
 
 obj-y				:= semaphore.o cputable.o ptrace.o syscalls.o \
-				   irq.o signal_32.o pmc.o
+				   irq.o signal_32.o pmc.o vdso.o
+obj-y				+= vdso32/
 obj-$(CONFIG_PPC64)		+= setup_64.o binfmt_elf32.o sys_ppc32.o \
 				   signal_64.o ptrace32.o systbl.o \
 				   paca.o ioctl32.o cpu_setup_power4.o \
-				   firmware.o sysfs.o
+				   firmware.o sysfs.o udbg.o
+obj-$(CONFIG_PPC64)		+= vdso64/
 obj-$(CONFIG_ALTIVEC)		+= vecemu.o vector.o
 obj-$(CONFIG_POWER4)		+= idle_power4.o
 obj-$(CONFIG_PPC_OF)		+= of_device.o
@@ -29,6 +31,10 @@ obj-$(CONFIG_RTAS_PROC)		+= rtas-proc.o
 obj-$(CONFIG_LPARCFG)		+= lparcfg.o
 obj-$(CONFIG_IBMVIO)		+= vio.o
 obj-$(CONFIG_GENERIC_TBSYNC)	+= smp-tbsync.o
+obj-$(CONFIG_PPC_PSERIES)	+= udbg_16550.o
+obj-$(CONFIG_PPC_MAPLE)		+= udbg_16550.o
+udbgscc-$(CONFIG_PPC64)		:= udbg_scc.o
+obj-$(CONFIG_PPC_PMAC)		+= $(udbgscc-y)
 
 ifeq ($(CONFIG_PPC_MERGE),y)
 

arch/powerpc/kernel/asm-offsets.c

@@ -37,12 +37,12 @@
 #include <asm/cputable.h>
 #include <asm/thread_info.h>
 #include <asm/rtas.h>
+#include <asm/vdso_datapage.h>
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
 #include <asm/lppaca.h>
 #include <asm/iseries/hv_lp_event.h>
 #include <asm/cache.h>
-#include <asm/systemcfg.h>
 #include <asm/compat.h>
 #endif
 
@@ -251,25 +251,42 @@ int main(void)
 
 	DEFINE(TASK_SIZE, TASK_SIZE);
 	DEFINE(NUM_USER_SEGMENTS, TASK_SIZE>>28);
-#else /* CONFIG_PPC64 */
-	/* systemcfg offsets for use by vdso */
-	DEFINE(CFG_TB_ORIG_STAMP, offsetof(struct systemcfg, tb_orig_stamp));
-	DEFINE(CFG_TB_TICKS_PER_SEC, offsetof(struct systemcfg, tb_ticks_per_sec));
-	DEFINE(CFG_TB_TO_XS, offsetof(struct systemcfg, tb_to_xs));
-	DEFINE(CFG_STAMP_XSEC, offsetof(struct systemcfg, stamp_xsec));
-	DEFINE(CFG_TB_UPDATE_COUNT, offsetof(struct systemcfg, tb_update_count));
-	DEFINE(CFG_TZ_MINUTEWEST, offsetof(struct systemcfg, tz_minuteswest));
-	DEFINE(CFG_TZ_DSTTIME, offsetof(struct systemcfg, tz_dsttime));
-	DEFINE(CFG_SYSCALL_MAP32, offsetof(struct systemcfg, syscall_map_32));
-	DEFINE(CFG_SYSCALL_MAP64, offsetof(struct systemcfg, syscall_map_64));
+#endif /* ! CONFIG_PPC64 */
 
-	/* timeval/timezone offsets for use by vdso */
+	/* datapage offsets for use by vdso */
+	DEFINE(CFG_TB_ORIG_STAMP, offsetof(struct vdso_data, tb_orig_stamp));
+	DEFINE(CFG_TB_TICKS_PER_SEC, offsetof(struct vdso_data, tb_ticks_per_sec));
+	DEFINE(CFG_TB_TO_XS, offsetof(struct vdso_data, tb_to_xs));
+	DEFINE(CFG_STAMP_XSEC, offsetof(struct vdso_data, stamp_xsec));
+	DEFINE(CFG_TB_UPDATE_COUNT, offsetof(struct vdso_data, tb_update_count));
+	DEFINE(CFG_TZ_MINUTEWEST, offsetof(struct vdso_data, tz_minuteswest));
+	DEFINE(CFG_TZ_DSTTIME, offsetof(struct vdso_data, tz_dsttime));
+	DEFINE(CFG_SYSCALL_MAP32, offsetof(struct vdso_data, syscall_map_32));
+	DEFINE(WTOM_CLOCK_SEC, offsetof(struct vdso_data, wtom_clock_sec));
+	DEFINE(WTOM_CLOCK_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
+#ifdef CONFIG_PPC64
+	DEFINE(CFG_SYSCALL_MAP64, offsetof(struct vdso_data, syscall_map_64));
 	DEFINE(TVAL64_TV_SEC, offsetof(struct timeval, tv_sec));
 	DEFINE(TVAL64_TV_USEC, offsetof(struct timeval, tv_usec));
 	DEFINE(TVAL32_TV_SEC, offsetof(struct compat_timeval, tv_sec));
 	DEFINE(TVAL32_TV_USEC, offsetof(struct compat_timeval, tv_usec));
+	DEFINE(TSPC32_TV_SEC, offsetof(struct compat_timespec, tv_sec));
+	DEFINE(TSPC32_TV_NSEC, offsetof(struct compat_timespec, tv_nsec));
+#else
+	DEFINE(TVAL32_TV_SEC, offsetof(struct timeval, tv_sec));
+	DEFINE(TVAL32_TV_USEC, offsetof(struct timeval, tv_usec));
+	DEFINE(TSPEC32_TV_SEC, offsetof(struct timespec, tv_sec));
+	DEFINE(TSPEC32_TV_NSEC, offsetof(struct timespec, tv_nsec));
+#endif
+	/* timeval/timezone offsets for use by vdso */
 	DEFINE(TZONE_TZ_MINWEST, offsetof(struct timezone, tz_minuteswest));
 	DEFINE(TZONE_TZ_DSTTIME, offsetof(struct timezone, tz_dsttime));
-#endif /* CONFIG_PPC64 */
+
+	/* Other bits used by the vdso */
+	DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
+	DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
+	DEFINE(NSEC_PER_SEC, NSEC_PER_SEC);
+	DEFINE(CLOCK_REALTIME_RES, TICK_NSEC);
+
 	return 0;
 }

arch/powerpc/kernel/head_32.S

@@ -1100,6 +1100,7 @@ start_here:
 	mr	r3,r31
 	mr	r4,r30
 	bl	machine_init
+	bl	__save_cpu_setup
 	bl	MMU_init
 
 #ifdef CONFIG_APUS

arch/powerpc/kernel/lparcfg.c

@@ -35,7 +35,7 @@
 #include <asm/time.h>
 #include <asm/iseries/it_exp_vpd_panel.h>
 #include <asm/prom.h>
-#include <asm/systemcfg.h>
+#include <asm/vdso_datapage.h>
 
 #define MODULE_VERS "1.6"
 #define MODULE_NAME "lparcfg"
@@ -43,7 +43,7 @@
 /* #define LPARCFG_DEBUG */
 
 /* find a better place for this function... */
-void log_plpar_hcall_return(unsigned long rc, char *tag)
+static void log_plpar_hcall_return(unsigned long rc, char *tag)
 {
 	if (rc == 0)		/* success, return */
 		return;
@@ -213,11 +213,10 @@ static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
 	unsigned long dummy;
 	rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
 
-	log_plpar_hcall_return(rc, "H_PIC");
+	if (rc != H_Authority)
+		log_plpar_hcall_return(rc, "H_PIC");
 }
 
-static unsigned long get_purr(void);
-
 /* Track sum of all purrs across all processors. This is used to further */
 /* calculate usage values by different applications                       */
 
@@ -319,8 +318,6 @@ static void parse_system_parameter_string(struct seq_file *m)
 	kfree(local_buffer);
 }
 
-static int lparcfg_count_active_processors(void);
-
 /* Return the number of processors in the system.
  * This function reads through the device tree and counts
  * the virtual processors, this does not include threads.
@@ -372,7 +369,7 @@ static int lparcfg_data(struct seq_file *m, void *v)
 	lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 
 	if (lrdrp == NULL) {
-		partition_potential_processors = _systemcfg->processorCount;
+		partition_potential_processors = vdso_data->processorCount;
 	} else {
 		partition_potential_processors = *(lrdrp + 4);
 	}
@@ -548,7 +545,7 @@ static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 		retval = -EIO;
 	}
 
-      out:
+out:
 	kfree(kbuf);
 	return retval;
 }
@@ -561,10 +558,10 @@ static int lparcfg_open(struct inode *inode, struct file *file)
 }
 
 struct file_operations lparcfg_fops = {
-      .owner	= THIS_MODULE,
-      .read	= seq_read,
-      .open	= lparcfg_open,
-      .release	= single_release,
+	.owner		= THIS_MODULE,
+	.read		= seq_read,
+	.open		= lparcfg_open,
+	.release	= single_release,
 };
 
 int __init lparcfg_init(void)

arch/powerpc/kernel/paca.c

@@ -15,17 +15,10 @@
 #include <asm/processor.h>
 #include <asm/ptrace.h>
 #include <asm/page.h>
-#include <asm/systemcfg.h>
 #include <asm/lppaca.h>
 #include <asm/iseries/it_lp_queue.h>
 #include <asm/paca.h>
 
-static union {
-	struct systemcfg	data;
-	u8			page[PAGE_SIZE];
-} systemcfg_store __attribute__((__section__(".data.page.aligned")));
-struct systemcfg *_systemcfg = &systemcfg_store.data;
-
 
 /* This symbol is provided by the linker - let it fill in the paca
  * field correctly */

arch/powerpc/kernel/proc_ppc64.c

@@ -23,7 +23,7 @@
 #include <linux/slab.h>
 #include <linux/kernel.h>
 
-#include <asm/systemcfg.h>
+#include <asm/vdso_datapage.h>
 #include <asm/rtas.h>
 #include <asm/uaccess.h>
 #include <asm/prom.h>
@@ -72,7 +72,7 @@ static int __init proc_ppc64_init(void)
 	if (!pde)
 		return 1;
 	pde->nlink = 1;
-	pde->data = _systemcfg;
+	pde->data = vdso_data;
 	pde->size = PAGE_SIZE;
 	pde->proc_fops = &page_map_fops;
 

arch/powerpc/kernel/rtas-proc.c

@@ -32,7 +32,6 @@
 #include <asm/rtas.h>
 #include <asm/machdep.h> /* for ppc_md */
 #include <asm/time.h>
-#include <asm/systemcfg.h>
 
 /* Token for Sensors */
 #define KEY_SWITCH		0x0001

arch/powerpc/kernel/setup-common.c

@@ -33,7 +33,7 @@
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/processor.h>
-#include <asm/systemcfg.h>
+#include <asm/vdso_datapage.h>
 #include <asm/pgtable.h>
 #include <asm/smp.h>
 #include <asm/elf.h>
@@ -444,10 +444,8 @@ void __init check_for_initrd(void)
 	if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 	    initrd_end > initrd_start)
 		ROOT_DEV = Root_RAM0;
-	else {
-		printk("Bogus initrd %08lx %08lx\n", initrd_start, initrd_end);
+	else
 		initrd_start = initrd_end = 0;
-	}
 
 	if (initrd_start)
 		printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
@@ -566,7 +564,7 @@ void __init smp_setup_cpu_maps(void)
 			cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 	}
 
-	_systemcfg->processorCount = num_present_cpus();
+	vdso_data->processorCount = num_present_cpus();
 #endif /* CONFIG_PPC64 */
 }
 #endif /* CONFIG_SMP */

arch/powerpc/kernel/setup_64.c

@@ -57,7 +57,6 @@
 #include <asm/lmb.h>
 #include <asm/iseries/it_lp_naca.h>
 #include <asm/firmware.h>
-#include <asm/systemcfg.h>
 #include <asm/xmon.h>
 #include <asm/udbg.h>
 
@@ -375,9 +374,8 @@ static void __init initialize_cache_info(void)
 				DBG("Argh, can't find dcache properties ! "
 				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
 
-			_systemcfg->dcache_size = ppc64_caches.dsize = size;
-			_systemcfg->dcache_line_size =
-				ppc64_caches.dline_size = lsize;
+			ppc64_caches.dsize = size;
+			ppc64_caches.dline_size = lsize;
 			ppc64_caches.log_dline_size = __ilog2(lsize);
 			ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
 
@@ -393,22 +391,13 @@ static void __init initialize_cache_info(void)
 				DBG("Argh, can't find icache properties ! "
 				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
 
-			_systemcfg->icache_size = ppc64_caches.isize = size;
-			_systemcfg->icache_line_size =
-				ppc64_caches.iline_size = lsize;
+			ppc64_caches.isize = size;
+			ppc64_caches.iline_size = lsize;
 			ppc64_caches.log_iline_size = __ilog2(lsize);
 			ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
 		}
 	}
 
-	/* Add an eye catcher and the systemcfg layout version number */
-	strcpy(_systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
-	_systemcfg->version.major = SYSTEMCFG_MAJOR;
-	_systemcfg->version.minor = SYSTEMCFG_MINOR;
-	_systemcfg->processor = mfspr(SPRN_PVR);
-	_systemcfg->platform = _machine;
-	_systemcfg->physicalMemorySize = lmb_phys_mem_size();
-
 	DBG(" <- initialize_cache_info()\n");
 }
 
@@ -495,15 +484,14 @@ void __init setup_system(void)
 
 	printk("-----------------------------------------------------\n");
 	printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
-	printk("ppc64_interrupt_controller    = 0x%ld\n", ppc64_interrupt_controller);
-	printk("systemcfg                     = 0x%p\n", _systemcfg);
-	printk("systemcfg->platform           = 0x%x\n", _systemcfg->platform);
-	printk("systemcfg->processorCount     = 0x%lx\n", _systemcfg->processorCount);
-	printk("systemcfg->physicalMemorySize = 0x%lx\n", _systemcfg->physicalMemorySize);
+	printk("ppc64_interrupt_controller    = 0x%ld\n",
+	       ppc64_interrupt_controller);
+	printk("platform                      = 0x%x\n", _machine);
+	printk("physicalMemorySize            = 0x%lx\n", lmb_phys_mem_size());
 	printk("ppc64_caches.dcache_line_size = 0x%x\n",
-			ppc64_caches.dline_size);
+	       ppc64_caches.dline_size);
 	printk("ppc64_caches.icache_line_size = 0x%x\n",
-			ppc64_caches.iline_size);
+	       ppc64_caches.iline_size);
 	printk("htab_address                  = 0x%p\n", htab_address);
 	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
 	printk("-----------------------------------------------------\n");
@@ -567,33 +555,6 @@ static void __init emergency_stack_init(void)
 		__va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
 }
 
-/*
- * Called from setup_arch to initialize the bitmap of available
- * syscalls in the systemcfg page
- */
-void __init setup_syscall_map(void)
-{
-	unsigned int i, count64 = 0, count32 = 0;
-	extern unsigned long *sys_call_table;
-	extern unsigned long sys_ni_syscall;
-
-
-	for (i = 0; i < __NR_syscalls; i++) {
-		if (sys_call_table[i*2] != sys_ni_syscall) {
-			count64++;
-			_systemcfg->syscall_map_64[i >> 5] |=
-				0x80000000UL >> (i & 0x1f);
-		}
-		if (sys_call_table[i*2+1] != sys_ni_syscall) {
-			count32++;
-			_systemcfg->syscall_map_32[i >> 5] |=
-				0x80000000UL >> (i & 0x1f);
-		}
-	}
-	printk(KERN_INFO "Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
-	       count32, count64);
-}
-
 /*
  * Called into from start_kernel, after lock_kernel has been called.
  * Initializes bootmem, which is unsed to manage page allocation until
@@ -635,9 +596,6 @@ void __init setup_arch(char **cmdline_p)
 	do_init_bootmem();
 	sparse_init();
 
-	/* initialize the syscall map in systemcfg */
-	setup_syscall_map();
-
 #ifdef CONFIG_DUMMY_CONSOLE
 	conswitchp = &dummy_con;
 #endif

arch/powerpc/kernel/signal_32.c

@@ -43,10 +43,10 @@
 #include <asm/uaccess.h>
 #include <asm/cacheflush.h>
 #include <asm/sigcontext.h>
+#include <asm/vdso.h>
 #ifdef CONFIG_PPC64
 #include "ppc32.h"
 #include <asm/unistd.h>
-#include <asm/vdso.h>
 #else
 #include <asm/ucontext.h>
 #include <asm/pgtable.h>
@@ -809,14 +809,11 @@ static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka,
 
 	/* Save user registers on the stack */
 	frame = &rt_sf->uc.uc_mcontext;
-#ifdef CONFIG_PPC64
 	if (vdso32_rt_sigtramp && current->thread.vdso_base) {
 		if (save_user_regs(regs, frame, 0))
 			goto badframe;
 		regs->link = current->thread.vdso_base + vdso32_rt_sigtramp;
-	} else
-#endif
-	{
+	} else {
 		if (save_user_regs(regs, frame, __NR_rt_sigreturn))
 			goto badframe;
 		regs->link = (unsigned long) frame->tramp;
@@ -1090,14 +1087,11 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka,
 	    || __put_user(sig, &sc->signal))
 		goto badframe;
 
-#ifdef CONFIG_PPC64
 	if (vdso32_sigtramp && current->thread.vdso_base) {
 		if (save_user_regs(regs, &frame->mctx, 0))
 			goto badframe;
 		regs->link = current->thread.vdso_base + vdso32_sigtramp;
-	} else
-#endif
-	{
+	} else {
 		if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
 			goto badframe;
 		regs->link = (unsigned long) frame->mctx.tramp;

arch/powerpc/kernel/smp.c

@@ -44,7 +44,7 @@
 #include <asm/cputable.h>
 #include <asm/system.h>
 #include <asm/mpic.h>
-#include <asm/systemcfg.h>
+#include <asm/vdso_datapage.h>
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
 #endif
@@ -371,7 +371,7 @@ int generic_cpu_disable(void)
 
 	cpu_clear(cpu, cpu_online_map);
 #ifdef CONFIG_PPC64
-	_systemcfg->processorCount--;
+	vdso_data->processorCount--;
 	fixup_irqs(cpu_online_map);
 #endif
 	return 0;

arch/powerpc/kernel/sysfs.c

@@ -16,7 +16,6 @@
 #include <asm/firmware.h>
 #include <asm/hvcall.h>
 #include <asm/prom.h>
-#include <asm/systemcfg.h>
 #include <asm/paca.h>
 #include <asm/lppaca.h>
 #include <asm/machdep.h>

arch/powerpc/kernel/time.c

@@ -62,8 +62,8 @@
 #include <asm/irq.h>
 #include <asm/div64.h>
 #include <asm/smp.h>
+#include <asm/vdso_datapage.h>
 #ifdef CONFIG_PPC64
-#include <asm/systemcfg.h>
 #include <asm/firmware.h>
 #endif
 #ifdef CONFIG_PPC_ISERIES
@@ -261,7 +261,6 @@ static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec,
 	do_gtod.varp = temp_varp;
 	do_gtod.var_idx = temp_idx;
 
-#ifdef CONFIG_PPC64
 	/*
 	 * tb_update_count is used to allow the userspace gettimeofday code
 	 * to assure itself that it sees a consistent view of the tb_to_xs and
@@ -271,14 +270,15 @@ static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec,
 	 * tb_to_xs and stamp_xsec values are consistent.  If not, then it
 	 * loops back and reads them again until this criteria is met.
 	 */
-	++(_systemcfg->tb_update_count);
+	++(vdso_data->tb_update_count);
 	smp_wmb();
-	_systemcfg->tb_orig_stamp = new_tb_stamp;
-	_systemcfg->stamp_xsec = new_stamp_xsec;
-	_systemcfg->tb_to_xs = new_tb_to_xs;
+	vdso_data->tb_orig_stamp = new_tb_stamp;
+	vdso_data->stamp_xsec = new_stamp_xsec;
+	vdso_data->tb_to_xs = new_tb_to_xs;
+	vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
+	vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
 	smp_wmb();
-	++(_systemcfg->tb_update_count);
-#endif
+	++(vdso_data->tb_update_count);
 }
 
 /*
@@ -357,9 +357,8 @@ static void iSeries_tb_recal(void)
 				do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
 				tb_to_xs = divres.result_low;
 				do_gtod.varp->tb_to_xs = tb_to_xs;
-				_systemcfg->tb_ticks_per_sec =
-					tb_ticks_per_sec;
-				_systemcfg->tb_to_xs = tb_to_xs;
+				vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
+				vdso_data->tb_to_xs = tb_to_xs;
 			}
 			else {
 				printk( "Titan recalibrate: FAILED (difference > 4 percent)\n"
@@ -561,10 +560,8 @@ int do_settimeofday(struct timespec *tv)
 	new_xsec += (u64)new_sec * XSEC_PER_SEC - tb_delta_xs;
 	update_gtod(tb_last_jiffy, new_xsec, do_gtod.varp->tb_to_xs);
 
-#ifdef CONFIG_PPC64
-	_systemcfg->tz_minuteswest = sys_tz.tz_minuteswest;
-	_systemcfg->tz_dsttime = sys_tz.tz_dsttime;
-#endif
+	vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
+	vdso_data->tz_dsttime = sys_tz.tz_dsttime;
 
 	write_sequnlock_irqrestore(&xtime_lock, flags);
 	clock_was_set();
@@ -713,13 +710,12 @@ void __init time_init(void)
 	do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
 	do_gtod.varp->tb_to_xs = tb_to_xs;
 	do_gtod.tb_to_us = tb_to_us;
-#ifdef CONFIG_PPC64
-	_systemcfg->tb_orig_stamp = tb_last_jiffy;
-	_systemcfg->tb_update_count = 0;
-	_systemcfg->tb_ticks_per_sec = tb_ticks_per_sec;
-	_systemcfg->stamp_xsec = xtime.tv_sec * XSEC_PER_SEC;
-	_systemcfg->tb_to_xs = tb_to_xs;
-#endif
+
+	vdso_data->tb_orig_stamp = tb_last_jiffy;
+	vdso_data->tb_update_count = 0;
+	vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
+	vdso_data->stamp_xsec = xtime.tv_sec * XSEC_PER_SEC;
+	vdso_data->tb_to_xs = tb_to_xs;
 
 	time_freq = 0;
 

arch/powerpc/kernel/traps.c

@@ -49,7 +49,6 @@
 #ifdef CONFIG_PPC64
 #include <asm/firmware.h>
 #include <asm/processor.h>
-#include <asm/systemcfg.h>
 #endif
 
 #ifdef CONFIG_PPC64	/* XXX */

arch/ppc64/kernel/vdso32/Makefile → arch/powerpc/kernel/vdso32/Makefile

@@ -5,6 +5,10 @@ obj-vdso32 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o
 
 # Build rules
 
+ifeq ($(CONFIG_PPC32),y)
+CROSS32CC := $(CC)
+endif
+
 targets := $(obj-vdso32) vdso32.so
 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
 
@@ -15,7 +19,7 @@ EXTRA_AFLAGS := -D__VDSO32__ -s
 
 obj-y += vdso32_wrapper.o
 extra-y += vdso32.lds
-CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
+CPPFLAGS_vdso32.lds += -P -C -Upowerpc
 
 # Force dependency (incbin is bad)
 $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so

arch/ppc64/kernel/vdso32/datapage.S → arch/powerpc/kernel/vdso32/datapage.S

@@ -66,3 +66,19 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
 	blr
   .cfi_endproc
 V_FUNCTION_END(__kernel_get_syscall_map)
+
+/*
+ * void unsigned long long  __kernel_get_tbfreq(void);
+ *
+ * returns the timebase frequency in HZ
+ */
+V_FUNCTION_BEGIN(__kernel_get_tbfreq)
+  .cfi_startproc
+	mflr	r12
+  .cfi_register lr,r12
+	bl	__get_datapage@local
+	lwz	r3,CFG_TB_TICKS_PER_SEC(r3)
+	lwz	r4,(CFG_TB_TICKS_PER_SEC + 4)(r3)
+	mtlr	r12
+  .cfi_endproc
+V_FUNCTION_END(__kernel_get_tbfreq)

arch/ppc64/kernel/vdso32/gettimeofday.S → arch/powerpc/kernel/vdso32/gettimeofday.S

@@ -2,7 +2,8 @@
  * Userland implementation of gettimeofday() for 32 bits processes in a
  * ppc64 kernel for use in the vDSO
  *
- * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp.
+ * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org,
+ *                    IBM Corp.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -61,25 +62,194 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
 	li	r3,0
 	blr
 
-2:	mr	r3,r10
+2:
+	mtlr	r12
+	mr	r3,r10
 	mr	r4,r11
 	li	r0,__NR_gettimeofday
 	sc
-	b	1b
+	blr
   .cfi_endproc
 V_FUNCTION_END(__kernel_gettimeofday)
 
 /*
- * This is the core of gettimeofday(), it returns the xsec
+ * Exact prototype of clock_gettime()
+ *
+ * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp);
+ *
+ */
+V_FUNCTION_BEGIN(__kernel_clock_gettime)
+  .cfi_startproc
+	/* Check for supported clock IDs */
+	cmpli	cr0,r3,CLOCK_REALTIME
+	cmpli	cr1,r3,CLOCK_MONOTONIC
+	cror	cr0,cr0,cr1
+	bne	cr0,99f
+
+	mflr	r12			/* r12 saves lr */
+  .cfi_register lr,r12
+	mr	r10,r3			/* r10 saves id */
+	mr	r11,r4			/* r11 saves tp */
+	bl	__get_datapage@local	/* get data page */
+	mr	r9, r3			/* datapage ptr in r9 */
+	beq	cr1,50f			/* if monotonic -> jump there */
+
+	/*
+	 * CLOCK_REALTIME
+	 */
+
+	bl	__do_get_xsec@local	/* get xsec from tb & kernel */
+	bne-	98f			/* out of line -> do syscall */
+
+	/* seconds are xsec >> 20 */
+	rlwinm	r5,r4,12,20,31
+	rlwimi	r5,r3,12,0,19
+	stw	r5,TSPC32_TV_SEC(r11)
+
+	/* get remaining xsec and convert to nsec. we scale
+	 * up remaining xsec by 12 bits and get the top 32 bits
+	 * of the multiplication, then we multiply by 1000
+	 */
+	rlwinm	r5,r4,12,0,19
+	lis	r6,1000000@h
+	ori	r6,r6,1000000@l
+	mulhwu	r5,r5,r6
+	mulli	r5,r5,1000
+	stw	r5,TSPC32_TV_NSEC(r11)
+	mtlr	r12
+	li	r3,0
+	blr
+
+	/*
+	 * CLOCK_MONOTONIC
+	 */
+
+50:	bl	__do_get_xsec@local	/* get xsec from tb & kernel */
+	bne-	98f			/* out of line -> do syscall */
+
+	/* seconds are xsec >> 20 */
+	rlwinm	r6,r4,12,20,31
+	rlwimi	r6,r3,12,0,19
+
+	/* get remaining xsec and convert to nsec. we scale
+	 * up remaining xsec by 12 bits and get the top 32 bits
+	 * of the multiplication, then we multiply by 1000
+	 */
+	rlwinm	r7,r4,12,0,19
+	lis	r5,1000000@h
+	ori	r5,r5,1000000@l
+	mulhwu	r7,r7,r5
+	mulli	r7,r7,1000
+
+	/* now we must fixup using wall to monotonic. We need to snapshot
+	 * that value and do the counter trick again. Fortunately, we still
+	 * have the counter value in r8 that was returned by __do_get_xsec.
+	 * At this point, r6,r7 contain our sec/nsec values, r3,r4 and r5
+	 * can be used
+	 */
+
+	lwz	r3,WTOM_CLOCK_SEC(r9)
+	lwz	r4,WTOM_CLOCK_NSEC(r9)
+
+	/* We now have our result in r3,r4. We create a fake dependency
+	 * on that result and re-check the counter
+	 */
+	or	r5,r4,r3
+	xor	r0,r5,r5
+	add	r9,r9,r0
+#ifdef CONFIG_PPC64
+	lwz	r0,(CFG_TB_UPDATE_COUNT+4)(r9)
+#else
+	lwz	r0,(CFG_TB_UPDATE_COUNT)(r9)
+#endif
+        cmpl    cr0,r8,r0		/* check if updated */
+	bne-	50b
+
+	/* Calculate and store result. Note that this mimmics the C code,
+	 * which may cause funny results if nsec goes negative... is that
+	 * possible at all ?
+	 */
+	add	r3,r3,r6
+	add	r4,r4,r7
+	lis	r5,NSEC_PER_SEC@h
+	ori	r5,r5,NSEC_PER_SEC@l
+	cmpli	cr0,r4,r5
+	blt	1f
+	subf	r4,r5,r4
+	addi	r3,r3,1
+1:	stw	r3,TSPC32_TV_SEC(r11)
+	stw	r4,TSPC32_TV_NSEC(r11)
+
+	mtlr	r12
+	li	r3,0
+	blr
+
+	/*
+	 * syscall fallback
+	 */
+98:
+	mtlr	r12
+	mr	r3,r10
+	mr	r4,r11
+99:
+	li	r0,__NR_clock_gettime
+	sc
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_clock_gettime)
+
+
+/*
+ * Exact prototype of clock_getres()
+ *
+ * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res);
+ *
+ */
+V_FUNCTION_BEGIN(__kernel_clock_getres)
+  .cfi_startproc
+	/* Check for supported clock IDs */
+	cmpwi	cr0,r3,CLOCK_REALTIME
+	cmpwi	cr1,r3,CLOCK_MONOTONIC
+	cror	cr0,cr0,cr1
+	bne	cr0,99f
+
+	li	r3,0
+	cmpli	cr0,r4,0
+	beqlr
+	lis	r5,CLOCK_REALTIME_RES@h
+	ori	r5,r5,CLOCK_REALTIME_RES@l
+	stw	r3,TSPC32_TV_SEC(r4)
+	stw	r5,TSPC32_TV_NSEC(r4)
+	blr
+
+	/*
+	 * syscall fallback
+	 */
+99:
+	li	r0,__NR_clock_getres
+	sc
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_clock_getres)
+
+
+/*
+ * This is the core of gettimeofday() & friends, it returns the xsec
  * value in r3 & r4 and expects the datapage ptr (non clobbered)
- * in r9. clobbers r0,r4,r5,r6,r7,r8
-*/
+ * in r9. clobbers r0,r4,r5,r6,r7,r8.
+ * When returning, r8 contains the counter value that can be reused
+ * by the monotonic clock implementation
+ */
 __do_get_xsec:
   .cfi_startproc
 	/* Check for update count & load values. We use the low
 	 * order 32 bits of the update count
 	 */
+#ifdef CONFIG_PPC64
 1:	lwz	r8,(CFG_TB_UPDATE_COUNT+4)(r9)
+#else
+1:	lwz	r8,(CFG_TB_UPDATE_COUNT)(r9)
+#endif
 	andi.	r0,r8,1			/* pending update ? loop */
 	bne-	1b
 	xor	r0,r8,r8		/* create dependency */
@@ -96,9 +266,9 @@ __do_get_xsec:
 	cmpl	cr0,r3,r0
 	bne-	2b
 
-	/* Substract tb orig stamp. If the high part is non-zero, we jump to the
-	 * slow path which call the syscall. If it's ok, then we have our 32 bits
-	 * tb_ticks value in r7
+	/* Substract tb orig stamp. If the high part is non-zero, we jump to
+	 * the slow path which call the syscall.
+	 * If it's ok, then we have our 32 bits tb_ticks value in r7
 	 */
 	subfc	r7,r6,r4
 	subfe.	r0,r5,r3
@@ -123,9 +293,14 @@ __do_get_xsec:
 	/* We now have our result in r3,r4. We create a fake dependency
 	 * on that result and re-check the counter
 	 */
-	xor	r0,r4,r4
+	or	r6,r4,r3
+	xor	r0,r6,r6
 	add	r9,r9,r0
+#ifdef CONFIG_PPC64
 	lwz	r0,(CFG_TB_UPDATE_COUNT+4)(r9)
+#else
+	lwz	r0,(CFG_TB_UPDATE_COUNT)(r9)
+#endif
         cmpl    cr0,r8,r0		/* check if updated */
 	bne-	1b
 

arch/ppc64/kernel/vdso32/vdso32.lds.S → arch/powerpc/kernel/vdso32/vdso32.lds.S

@@ -102,9 +102,12 @@ VERSION
 {
   VDSO_VERSION_STRING {
     global:
-	__kernel_datapage_offset; /* Has to be there for the kernel to find it */
+	__kernel_datapage_offset; /* Has to be there for the kernel to find */
 	__kernel_get_syscall_map;
 	__kernel_gettimeofday;
+	__kernel_clock_gettime;
+	__kernel_clock_getres;
+	__kernel_get_tbfreq;
 	__kernel_sync_dicache;
 	__kernel_sync_dicache_p5;
 	__kernel_sigtramp32;

arch/ppc64/kernel/vdso32/vdso32_wrapper.S → arch/powerpc/kernel/vdso32/vdso32_wrapper.S

@@ -6,7 +6,7 @@
 	.globl vdso32_start, vdso32_end
 	.balign PAGE_SIZE
 vdso32_start:
-	.incbin "arch/ppc64/kernel/vdso32/vdso32.so"
+	.incbin "arch/powerpc/kernel/vdso32/vdso32.so"
 	.balign PAGE_SIZE
 vdso32_end:
 

arch/ppc64/kernel/vdso64/datapage.S → arch/powerpc/kernel/vdso64/datapage.S

@@ -66,3 +66,19 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
 	blr
   .cfi_endproc
 V_FUNCTION_END(__kernel_get_syscall_map)
+
+
+/*
+ * void unsigned long  __kernel_get_tbfreq(void);
+ *
+ * returns the timebase frequency in HZ
+ */
+V_FUNCTION_BEGIN(__kernel_get_tbfreq)
+  .cfi_startproc
+	mflr	r12
+  .cfi_register lr,r12
+	bl	V_LOCAL_FUNC(__get_datapage)
+	ld	r3,CFG_TB_TICKS_PER_SEC(r3)
+	mtlr	r12
+  .cfi_endproc
+V_FUNCTION_END(__kernel_get_tbfreq)

arch/ppc64/kernel/vdso64/gettimeofday.S → arch/powerpc/kernel/vdso64/gettimeofday.S

@@ -15,6 +15,7 @@
 #include <asm/ppc_asm.h>
 #include <asm/vdso.h>
 #include <asm/asm-offsets.h>
+#include <asm/unistd.h>
 
 	.text
 /*
@@ -30,15 +31,17 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
 
 	mr	r11,r3			/* r11 holds tv */
 	mr	r10,r4			/* r10 holds tz */
-	bl	V_LOCAL_FUNC(__get_datapage)		/* get data page */
-	bl	V_LOCAL_FUNC(__do_get_xsec)		/* get xsec from tb & kernel */
+	bl	V_LOCAL_FUNC(__get_datapage)	/* get data page */
+	bl	V_LOCAL_FUNC(__do_get_xsec)	/* get xsec from tb & kernel */
 	lis     r7,15			/* r7 = 1000000 = USEC_PER_SEC */
 	ori     r7,r7,16960
 	rldicl  r5,r4,44,20		/* r5 = sec = xsec / XSEC_PER_SEC */
 	rldicr  r6,r5,20,43		/* r6 = sec * XSEC_PER_SEC */
 	std	r5,TVAL64_TV_SEC(r11)	/* store sec in tv */
 	subf	r0,r6,r4		/* r0 = xsec = (xsec - r6) */
-	mulld   r0,r0,r7		/* usec = (xsec * USEC_PER_SEC) / XSEC_PER_SEC */
+	mulld   r0,r0,r7		/* usec = (xsec * USEC_PER_SEC) /
+					 * XSEC_PER_SEC
+					 */
 	rldicl  r0,r0,44,20
 	cmpldi	cr0,r10,0		/* check if tz is NULL */
 	std	r0,TVAL64_TV_USEC(r11)	/* store usec in tv */
@@ -54,37 +57,185 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
 V_FUNCTION_END(__kernel_gettimeofday)
 
 
+/*
+ * Exact prototype of clock_gettime()
+ *
+ * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp);
+ *
+ */
+V_FUNCTION_BEGIN(__kernel_clock_gettime)
+  .cfi_startproc
+	/* Check for supported clock IDs */
+	cmpwi	cr0,r3,CLOCK_REALTIME
+	cmpwi	cr1,r3,CLOCK_MONOTONIC
+	cror	cr0,cr0,cr1
+	bne	cr0,99f
+
+	mflr	r12			/* r12 saves lr */
+  .cfi_register lr,r12
+	mr	r10,r3			/* r10 saves id */
+	mr	r11,r4			/* r11 saves tp */
+	bl	V_LOCAL_FUNC(__get_datapage)	/* get data page */
+	beq	cr1,50f			/* if monotonic -> jump there */
+
+	/*
+	 * CLOCK_REALTIME
+	 */
+
+	bl	V_LOCAL_FUNC(__do_get_xsec)	/* get xsec from tb & kernel */
+
+	lis     r7,0x3b9a		/* r7 = 1000000000 = NSEC_PER_SEC */
+	ori     r7,r7,0xca00
+	rldicl  r5,r4,44,20		/* r5 = sec = xsec / XSEC_PER_SEC */
+	rldicr  r6,r5,20,43		/* r6 = sec * XSEC_PER_SEC */
+	std	r5,TSPC64_TV_SEC(r11)	/* store sec in tv */
+	subf	r0,r6,r4		/* r0 = xsec = (xsec - r6) */
+	mulld   r0,r0,r7		/* nsec = (xsec * NSEC_PER_SEC) /
+					 * XSEC_PER_SEC
+					 */
+	rldicl  r0,r0,44,20
+	std	r0,TSPC64_TV_NSEC(r11)	/* store nsec in tp */
+
+	mtlr	r12
+	li	r3,0
+	blr
+
+	/*
+	 * CLOCK_MONOTONIC
+	 */
+
+50:	bl	V_LOCAL_FUNC(__do_get_xsec)	/* get xsec from tb & kernel */
+
+	lis     r7,0x3b9a		/* r7 = 1000000000 = NSEC_PER_SEC */
+	ori     r7,r7,0xca00
+	rldicl  r5,r4,44,20		/* r5 = sec = xsec / XSEC_PER_SEC */
+	rldicr  r6,r5,20,43		/* r6 = sec * XSEC_PER_SEC */
+	subf	r0,r6,r4		/* r0 = xsec = (xsec - r6) */
+	mulld   r0,r0,r7		/* nsec = (xsec * NSEC_PER_SEC) /
+					 * XSEC_PER_SEC
+					 */
+	rldicl  r6,r0,44,20
+
+	/* now we must fixup using wall to monotonic. We need to snapshot
+	 * that value and do the counter trick again. Fortunately, we still
+	 * have the counter value in r8 that was returned by __do_get_xsec.
+	 * At this point, r5,r6 contain our sec/nsec values.
+	 * can be used
+	 */
+
+	lwz	r4,WTOM_CLOCK_SEC(r9)
+	lwz	r7,WTOM_CLOCK_NSEC(r9)
+
+	/* We now have our result in r4,r7. We create a fake dependency
+	 * on that result and re-check the counter
+	 */
+	or	r9,r4,r7
+	xor	r0,r9,r9
+	add	r3,r3,r0
+	ld	r0,CFG_TB_UPDATE_COUNT(r3)
+        cmpld   cr0,r0,r8		/* check if updated */
+	bne-	50b
+
+	/* Calculate and store result. Note that this mimmics the C code,
+	 * which may cause funny results if nsec goes negative... is that
+	 * possible at all ?
+	 */
+	add	r4,r4,r5
+	add	r7,r7,r6
+	lis	r9,NSEC_PER_SEC@h
+	ori	r9,r9,NSEC_PER_SEC@l
+	cmpli	cr0,r7,r9
+	blt	1f
+	subf	r7,r9,r7
+	addi	r4,r4,1
+1:	std	r4,TSPC64_TV_SEC(r11)
+	std	r7,TSPC64_TV_NSEC(r11)
+
+	mtlr	r12
+	li	r3,0
+	blr
+
+	/*
+	 * syscall fallback
+	 */
+98:
+	mtlr	r12
+	mr	r3,r10
+	mr	r4,r11
+99:
+	li	r0,__NR_clock_gettime
+	sc
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_clock_gettime)
+
+
+/*
+ * Exact prototype of clock_getres()
+ *
+ * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res);
+ *
+ */
+V_FUNCTION_BEGIN(__kernel_clock_getres)
+  .cfi_startproc
+	/* Check for supported clock IDs */
+	cmpwi	cr0,r3,CLOCK_REALTIME
+	cmpwi	cr1,r3,CLOCK_MONOTONIC
+	cror	cr0,cr0,cr1
+	bne	cr0,99f
+
+	li	r3,0
+	cmpli	cr0,r4,0
+	beqlr
+	lis	r5,CLOCK_REALTIME_RES@h
+	ori	r5,r5,CLOCK_REALTIME_RES@l
+	std	r3,TSPC64_TV_SEC(r4)
+	std	r5,TSPC64_TV_NSEC(r4)
+	blr
+
+	/*
+	 * syscall fallback
+	 */
+99:
+	li	r0,__NR_clock_getres
+	sc
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_clock_getres)
+
+
 /*
  * This is the core of gettimeofday(), it returns the xsec
  * value in r4 and expects the datapage ptr (non clobbered)
  * in r3. clobbers r0,r4,r5,r6,r7,r8
-*/
+ * When returning, r8 contains the counter value that can be reused
+ */
 V_FUNCTION_BEGIN(__do_get_xsec)
   .cfi_startproc
 	/* check for update count & load values */
-1:	ld	r7,CFG_TB_UPDATE_COUNT(r3)
+1:	ld	r8,CFG_TB_UPDATE_COUNT(r3)
 	andi.	r0,r4,1			/* pending update ? loop */
 	bne-	1b
 	xor	r0,r4,r4		/* create dependency */
 	add	r3,r3,r0
 
 	/* Get TB & offset it */
-	mftb	r8
+	mftb	r7
 	ld	r9,CFG_TB_ORIG_STAMP(r3)
-	subf	r8,r9,r8
+	subf	r7,r9,r7
 
 	/* Scale result */
 	ld	r5,CFG_TB_TO_XS(r3)
-	mulhdu	r8,r8,r5
+	mulhdu	r7,r7,r5
 
 	/* Add stamp since epoch */
 	ld	r6,CFG_STAMP_XSEC(r3)
-	add	r4,r6,r8
+	add	r4,r6,r7
 
 	xor	r0,r4,r4
 	add	r3,r3,r0
 	ld	r0,CFG_TB_UPDATE_COUNT(r3)
-        cmpld   cr0,r0,r7		/* check if updated */
+        cmpld   cr0,r0,r8		/* check if updated */
 	bne-	1b
 	blr
   .cfi_endproc

arch/ppc64/kernel/vdso64/vdso64.lds.S → arch/powerpc/kernel/vdso64/vdso64.lds.S

@@ -102,9 +102,12 @@ VERSION
 {
   VDSO_VERSION_STRING {
     global:
-	__kernel_datapage_offset; /* Has to be there for the kernel to find it */
+	__kernel_datapage_offset; /* Has to be there for the kernel to find */
 	__kernel_get_syscall_map;
     	__kernel_gettimeofday;
+	__kernel_clock_gettime;
+	__kernel_clock_getres;
+	__kernel_get_tbfreq;
 	__kernel_sync_dicache;
 	__kernel_sync_dicache_p5;
 	__kernel_sigtramp_rt64;

arch/ppc64/kernel/vdso64/vdso64_wrapper.S → arch/powerpc/kernel/vdso64/vdso64_wrapper.S

@@ -6,7 +6,7 @@
 	.globl vdso64_start, vdso64_end
 	.balign PAGE_SIZE
 vdso64_start:
-	.incbin "arch/ppc64/kernel/vdso64/vdso64.so"
+	.incbin "arch/powerpc/kernel/vdso64/vdso64.so"
 	.balign PAGE_SIZE
 vdso64_end:
 

arch/powerpc/mm/mem.c

@@ -46,9 +46,7 @@
 #include <asm/prom.h>
 #include <asm/lmb.h>
 #include <asm/sections.h>
-#ifdef CONFIG_PPC64
 #include <asm/vdso.h>
-#endif
 
 #include "mmu_decl.h"
 
@@ -397,10 +395,8 @@ void __init mem_init(void)
 
 	mem_init_done = 1;
 
-#ifdef CONFIG_PPC64
 	/* Initialize the vDSO */
 	vdso_init();
-#endif
 }
 
 /*

arch/powerpc/oprofile/op_model_power4.c

@@ -14,7 +14,6 @@
 #include <asm/system.h>
 #include <asm/processor.h>
 #include <asm/cputable.h>
-#include <asm/systemcfg.h>
 #include <asm/rtas.h>
 #include <asm/oprofile_impl.h>
 #include <asm/reg.h>

arch/powerpc/platforms/pseries/rtasd.c

@@ -27,7 +27,6 @@
 #include <asm/prom.h>
 #include <asm/nvram.h>
 #include <asm/atomic.h>
-#include <asm/systemcfg.h>
 
 #if 0
 #define DEBUG(A...)	printk(KERN_ERR A)

arch/powerpc/platforms/pseries/setup.c

@@ -306,9 +306,7 @@ static void __init fw_feature_init(void)
 	}
 
 	of_node_put(dn);
- no_rtas:
-	printk(KERN_INFO "firmware_features = 0x%lx\n", 
-	       ppc64_firmware_features);
+no_rtas:
 
 	DBG(" <- fw_feature_init()\n");
 }

arch/powerpc/platforms/pseries/smp.c

@@ -46,7 +46,7 @@
 #include <asm/rtas.h>
 #include <asm/pSeries_reconfig.h>
 #include <asm/mpic.h>
-#include <asm/systemcfg.h>
+#include <asm/vdso_datapage.h>
 
 #include "plpar_wrappers.h"
 
@@ -97,7 +97,7 @@ int pSeries_cpu_disable(void)
 	int cpu = smp_processor_id();
 
 	cpu_clear(cpu, cpu_online_map);
-	_systemcfg->processorCount--;
+	vdso_data->processorCount--;
 
 	/*fix boot_cpuid here*/
 	if (cpu == boot_cpuid)

arch/powerpc/xmon/xmon.c

@@ -1467,17 +1467,23 @@ read_spr(int n)
 {
 	unsigned int instrs[2];
 	unsigned long (*code)(void);
-	unsigned long opd[3];
 	unsigned long ret = -1UL;
+#ifdef CONFIG_PPC64
+	unsigned long opd[3];
 
-	instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
-	instrs[1] = 0x4e800020;
 	opd[0] = (unsigned long)instrs;
 	opd[1] = 0;
 	opd[2] = 0;
+	code = (unsigned long (*)(void)) opd;
+#else
+	code = (unsigned long (*)(void)) instrs;
+#endif
+
+	/* mfspr r3,n; blr */
+	instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
+	instrs[1] = 0x4e800020;
 	store_inst(instrs);
 	store_inst(instrs+1);
-	code = (unsigned long (*)(void)) opd;
 
 	if (setjmp(bus_error_jmp) == 0) {
 		catch_memory_errors = 1;
@@ -1499,16 +1505,21 @@ write_spr(int n, unsigned long val)
 {
 	unsigned int instrs[2];
 	unsigned long (*code)(unsigned long);
+#ifdef CONFIG_PPC64
 	unsigned long opd[3];
 
-	instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
-	instrs[1] = 0x4e800020;
 	opd[0] = (unsigned long)instrs;
 	opd[1] = 0;
 	opd[2] = 0;
+	code = (unsigned long (*)(unsigned long)) opd;
+#else
+	code = (unsigned long (*)(unsigned long)) instrs;
+#endif
+
+	instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
+	instrs[1] = 0x4e800020;
 	store_inst(instrs);
 	store_inst(instrs+1);
-	code = (unsigned long (*)(unsigned long)) opd;
 
 	if (setjmp(bus_error_jmp) == 0) {
 		catch_memory_errors = 1;

arch/ppc/kernel/asm-offsets.c

@@ -25,6 +25,7 @@
 #include <asm/processor.h>
 #include <asm/cputable.h>
 #include <asm/thread_info.h>
+#include <asm/vdso_datapage.h>
 
 #define DEFINE(sym, val) \
 	asm volatile("\n->" #sym " %0 " #val : : "i" (val))
@@ -143,5 +144,32 @@ main(void)
 
 	DEFINE(TASK_SIZE, TASK_SIZE);
 	DEFINE(NUM_USER_SEGMENTS, TASK_SIZE>>28);
+
+	/* datapage offsets for use by vdso */
+	DEFINE(CFG_TB_ORIG_STAMP, offsetof(struct vdso_data, tb_orig_stamp));
+	DEFINE(CFG_TB_TICKS_PER_SEC, offsetof(struct vdso_data, tb_ticks_per_sec));
+	DEFINE(CFG_TB_TO_XS, offsetof(struct vdso_data, tb_to_xs));
+	DEFINE(CFG_STAMP_XSEC, offsetof(struct vdso_data, stamp_xsec));
+	DEFINE(CFG_TB_UPDATE_COUNT, offsetof(struct vdso_data, tb_update_count));
+	DEFINE(CFG_TZ_MINUTEWEST, offsetof(struct vdso_data, tz_minuteswest));
+	DEFINE(CFG_TZ_DSTTIME, offsetof(struct vdso_data, tz_dsttime));
+	DEFINE(CFG_SYSCALL_MAP32, offsetof(struct vdso_data, syscall_map_32));
+	DEFINE(WTOM_CLOCK_SEC, offsetof(struct vdso_data, wtom_clock_sec));
+	DEFINE(WTOM_CLOCK_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
+	DEFINE(TVAL32_TV_SEC, offsetof(struct timeval, tv_sec));
+	DEFINE(TVAL32_TV_USEC, offsetof(struct timeval, tv_usec));
+	DEFINE(TSPEC32_TV_SEC, offsetof(struct timespec, tv_sec));
+	DEFINE(TSPEC32_TV_NSEC, offsetof(struct timespec, tv_nsec));
+
+	/* timeval/timezone offsets for use by vdso */
+	DEFINE(TZONE_TZ_MINWEST, offsetof(struct timezone, tz_minuteswest));
+	DEFINE(TZONE_TZ_DSTTIME, offsetof(struct timezone, tz_dsttime));
+
+	/* Other bits used by the vdso */
+	DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
+	DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
+	DEFINE(NSEC_PER_SEC, NSEC_PER_SEC);
+	DEFINE(CLOCK_REALTIME_RES, TICK_NSEC);
+
 	return 0;
 }

arch/ppc/syslib/cpm2_pic.c

@@ -37,7 +37,7 @@ static	u_char	irq_to_siureg[] = {
 static	u_char	irq_to_siubit[] = {
 	 0, 15, 14, 13, 12, 11, 10,  9,
 	 8,  7,  6,  5,  4,  3,  2,  1,
-	 2,  1, 15, 14, 13, 12, 11, 10,
+	 2,  1,  0, 14, 13, 12, 11, 10,
 	 9,  8,  7,  6,  5,  4,  3,  0,
 	31, 30, 29, 28, 27, 26, 25, 24,
 	23, 22, 21, 20, 19, 18, 17, 16,

arch/ppc64/Kconfig

@@ -279,17 +279,12 @@ config ARCH_FLATMEM_ENABLE
        def_bool y
        depends on !NUMA
 
-config ARCH_DISCONTIGMEM_ENABLE
-	def_bool y
-	depends on SMP && PPC_PSERIES
-
-config ARCH_DISCONTIGMEM_DEFAULT
+config ARCH_SPARSEMEM_ENABLE
 	def_bool y
-	depends on ARCH_DISCONTIGMEM_ENABLE
 
-config ARCH_SPARSEMEM_ENABLE
+config ARCH_SPARSEMEM_DEFAULT
 	def_bool y
-	depends on ARCH_DISCONTIGMEM_ENABLE
+	depends on NUMA
 
 source "mm/Kconfig"
 

arch/ppc64/kernel/Makefile

@@ -13,10 +13,8 @@ endif
 
 obj-y               +=	idle.o dma.o \
 			align.o \
-			udbg.o \
 			rtc.o \
-			iommu.o vdso.o
-obj-y += vdso32/ vdso64/
+			iommu.o
 
 pci-obj-$(CONFIG_PPC_MULTIPLATFORM)	+= pci_dn.o pci_direct_iommu.o
 
@@ -27,8 +25,6 @@ ifneq ($(CONFIG_PPC_MERGE),y)
 obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o
 endif
 
-obj-$(CONFIG_PPC_PSERIES) += udbg_16550.o
-
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o
 obj-$(CONFIG_MODULES)		+= module.o
 ifneq ($(CONFIG_PPC_MERGE),y)
@@ -40,10 +36,6 @@ obj-$(CONFIG_BOOTX_TEXT)	+= btext.o
 endif
 obj-$(CONFIG_HVCS)		+= hvcserver.o
 
-obj-$(CONFIG_PPC_PMAC)		+= udbg_scc.o
-
-obj-$(CONFIG_PPC_MAPLE)		+= udbg_16550.o
-
 obj-$(CONFIG_KPROBES)		+= kprobes.o
 
 ifneq ($(CONFIG_PPC_MERGE),y)

arch/ppc64/kernel/misc.S

@@ -186,7 +186,8 @@ _KPROBE(__flush_icache_range)
 	bdnz	2b
 	isync
 	blr
-	.previous .text
+
+	.text
 /*
  * Like above, but only do the D-cache.
  *

include/asm-powerpc/auxvec.h

@@ -14,8 +14,6 @@
 /* The vDSO location. We have to use the same value as x86 for glibc's
  * sake :-)
  */
-#ifdef __powerpc64__
 #define AT_SYSINFO_EHDR		33
-#endif
 
 #endif

include/asm-powerpc/elf.h

@@ -269,14 +269,12 @@ extern int dcache_bsize;
 extern int icache_bsize;
 extern int ucache_bsize;
 
-#ifdef __powerpc64__
+/* vDSO has arch_setup_additional_pages */
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 struct linux_binprm;
-#define ARCH_HAS_SETUP_ADDITIONAL_PAGES	/* vDSO has arch_setup_additional_pages */
-extern int arch_setup_additional_pages(struct linux_binprm *bprm, int executable_stack);
+extern int arch_setup_additional_pages(struct linux_binprm *bprm,
+				       int executable_stack);
 #define VDSO_AUX_ENT(a,b) NEW_AUX_ENT(a,b);
-#else
-#define VDSO_AUX_ENT(a,b)
-#endif /* __powerpc64__ */
 
 /*
  * The requirements here are:

include/asm-powerpc/irq.h

@@ -389,6 +389,7 @@ extern u64 ppc64_interrupt_controller;
 #define	SIU_INT_TIMER4		((uint)0x0f + CPM_IRQ_OFFSET)
 #define	SIU_INT_TMCNT		((uint)0x10 + CPM_IRQ_OFFSET)
 #define	SIU_INT_PIT		((uint)0x11 + CPM_IRQ_OFFSET)
+#define	SIU_INT_PCI		((uint)0x12 + CPM_IRQ_OFFSET)
 #define	SIU_INT_IRQ1		((uint)0x13 + CPM_IRQ_OFFSET)
 #define	SIU_INT_IRQ2		((uint)0x14 + CPM_IRQ_OFFSET)
 #define	SIU_INT_IRQ3		((uint)0x15 + CPM_IRQ_OFFSET)

include/asm-powerpc/processor.h

@@ -177,8 +177,8 @@ struct thread_struct {
 #ifdef CONFIG_PPC64
 	unsigned long	start_tb;	/* Start purr when proc switched in */
 	unsigned long	accum_tb;	/* Total accumilated purr for process */
-	unsigned long	vdso_base;	/* base of the vDSO library */
 #endif
+	unsigned long	vdso_base;	/* base of the vDSO library */
 	unsigned long	dabr;		/* Data address breakpoint register */
 #ifdef CONFIG_ALTIVEC
 	/* Complete AltiVec register set */

include/asm-powerpc/sparsemem.h

@@ -8,8 +8,8 @@
  * MAX_PHYSMEM_BITS		2^N: how much memory we can have in that space
  */
 #define SECTION_SIZE_BITS       24
-#define MAX_PHYSADDR_BITS       38
-#define MAX_PHYSMEM_BITS        36
+#define MAX_PHYSADDR_BITS       44
+#define MAX_PHYSMEM_BITS        44
 
 #ifdef CONFIG_MEMORY_HOTPLUG
 extern void create_section_mapping(unsigned long start, unsigned long end);

include/asm-powerpc/topology.h

@@ -9,15 +9,7 @@
 
 static inline int cpu_to_node(int cpu)
 {
-	int node;
-
-	node = numa_cpu_lookup_table[cpu];
-
-#ifdef DEBUG_NUMA
-	BUG_ON(node == -1);
-#endif
-
-	return node;
+	return numa_cpu_lookup_table[cpu];
 }
 
 #define parent_node(node)	(node)
@@ -37,8 +29,6 @@ static inline int node_to_first_cpu(int node)
 #define pcibus_to_node(node)    (-1)
 #define pcibus_to_cpumask(bus)	(cpu_online_map)
 
-#define nr_cpus_node(node)	(nr_cpus_in_node[node])
-
 /* sched_domains SD_NODE_INIT for PPC64 machines */
 #define SD_NODE_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\

include/asm-ppc64/udbg.h → include/asm-powerpc/udbg.h

-#ifndef __UDBG_HDR
-#define __UDBG_HDR
-
-#include <linux/compiler.h>
-#include <linux/init.h>
-
 /*
  * c 2001 PPC 64 Team, IBM Corp
  *
@@ -13,6 +7,12 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#ifndef _ASM_POWERPC_UDBG_H
+#define _ASM_POWERPC_UDBG_H
+
+#include <linux/compiler.h>
+#include <linux/init.h>
+
 extern void (*udbg_putc)(unsigned char c);
 extern unsigned char (*udbg_getc)(void);
 extern int (*udbg_getc_poll)(void);
@@ -28,4 +28,4 @@ extern void udbg_init_uart(void __iomem *comport, unsigned int speed);
 
 struct device_node;
 extern void udbg_init_scc(struct device_node *np);
-#endif
+#endif /* _ASM_POWERPC_UDBG_H */

include/asm-powerpc/systemcfg.h → include/asm-powerpc/vdso_datapage.h

-#ifndef _SYSTEMCFG_H
-#define _SYSTEMCFG_H
+#ifndef _VDSO_DATAPAGE_H
+#define _VDSO_DATAPAGE_H
 
 /*
  * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
+ * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
+ * 		      IBM Corp.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -10,9 +12,20 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-/* Change Activity:
- * 2002/09/30 : bergner  : Created
- * End Change Activity
+
+/*
+ * Note about this structure:
+ *
+ * This structure was historically called systemcfg and exposed to
+ * userland via /proc/ppc64/systemcfg. Unfortunately, this became an
+ * ABI issue as some proprietary software started relying on being able
+ * to mmap() it, thus we have to keep the base layout at least for a
+ * few kernel versions.
+ *
+ * However, since ppc32 doesn't suffer from this backward handicap,
+ * a simpler version of the data structure is used there with only the
+ * fields actually used by the vDSO.
+ *
  */
 
 /*
@@ -28,7 +41,13 @@
 
 #define SYSCALL_MAP_SIZE      ((__NR_syscalls + 31) / 32)
 
-struct systemcfg {
+/*
+ * So here is the ppc64 backward compatible version
+ */
+
+#ifdef CONFIG_PPC64
+
+struct vdso_data {
 	__u8  eye_catcher[16];		/* Eyecatcher: SYSTEMCFG:PPC64	0x00 */
 	struct {			/* Systemcfg version numbers	     */
 		__u32 major;		/* Major number			0x10 */
@@ -46,17 +65,42 @@ struct systemcfg {
 	__u64 tb_update_count;		/* Timebase atomicity ctr	0x50 */
 	__u32 tz_minuteswest;		/* Minutes west of Greenwich	0x58 */
 	__u32 tz_dsttime;		/* Type of dst correction	0x5C */
-	/* next four are no longer used except to be exported to /proc */
 	__u32 dcache_size;		/* L1 d-cache size		0x60 */
 	__u32 dcache_line_size;		/* L1 d-cache line size		0x64 */
 	__u32 icache_size;		/* L1 i-cache size		0x68 */
 	__u32 icache_line_size;		/* L1 i-cache line size		0x6C */
-   	__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of available syscalls 0x70 */
-   	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of available syscalls */
+
+	/* those additional ones don't have to be located anywhere
+	 * special as they were not part of the original systemcfg
+	 */
+	__s64 wtom_clock_sec;			/* Wall to monotonic clock */
+	__s32 wtom_clock_nsec;
+   	__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls  */
+   	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
+};
+
+#else /* CONFIG_PPC64 */
+
+/*
+ * And here is the simpler 32 bits version
+ */
+struct vdso_data {
+	__u64 tb_orig_stamp;		/* Timebase at boot		0x30 */
+	__u64 tb_ticks_per_sec;		/* Timebase tics / sec		0x38 */
+	__u64 tb_to_xs;			/* Inverse of TB to 2^20	0x40 */
+	__u64 stamp_xsec;		/*				0x48 */
+	__u32 tb_update_count;		/* Timebase atomicity ctr	0x50 */
+	__u32 tz_minuteswest;		/* Minutes west of Greenwich	0x58 */
+	__u32 tz_dsttime;		/* Type of dst correction	0x5C */
+	__s32 wtom_clock_sec;			/* Wall to monotonic clock */
+	__s32 wtom_clock_nsec;
+   	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
 };
 
+#endif /* CONFIG_PPC64 */
+
 #ifdef __KERNEL__
-extern struct systemcfg *_systemcfg; /* to be renamed */
+extern struct vdso_data *vdso_data;
 #endif
 
 #endif /* __ASSEMBLY__ */

include/asm-ppc/page.h

 #ifndef _PPC_PAGE_H
 #define _PPC_PAGE_H
 
+#include <linux/config.h>
+#include <asm/asm-compat.h>
+
 /* PAGE_SHIFT determines the page size */
 #define PAGE_SHIFT	12
-#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
 
 /*
  * Subtle: this is an int (not an unsigned long) and so it
@@ -169,5 +172,8 @@ extern __inline__ int get_order(unsigned long size)
 #define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
 				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 
+/* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
+#define __HAVE_ARCH_GATE_AREA		1
+
 #endif /* __KERNEL__ */
 #endif /* _PPC_PAGE_H */

include/asm-ppc64/mmzone.h

@@ -8,15 +8,14 @@
 #define _ASM_MMZONE_H_
 
 #include <linux/config.h>
-#include <asm/smp.h>
 
-/* generic non-linear memory support:
+/*
+ * generic non-linear memory support:
  *
  * 1) we will not split memory into more chunks than will fit into the
  *    flags field of the struct page
  */
 
-
 #ifdef CONFIG_NEED_MULTIPLE_NODES
 
 extern struct pglist_data *node_data[];
@@ -30,44 +29,11 @@ extern struct pglist_data *node_data[];
  */
 
 extern int numa_cpu_lookup_table[];
-extern char *numa_memory_lookup_table;
 extern cpumask_t numa_cpumask_lookup_table[];
-extern int nr_cpus_in_node[];
 #ifdef CONFIG_MEMORY_HOTPLUG
 extern unsigned long max_pfn;
 #endif
 
-/* 16MB regions */
-#define MEMORY_INCREMENT_SHIFT 24
-#define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
-
-/* NUMA debugging, will not work on a DLPAR machine */
-#undef DEBUG_NUMA
-
-static inline int pa_to_nid(unsigned long pa)
-{
-	int nid;
-
-#ifdef CONFIG_MEMORY_HOTPLUG
-	/* kludge hot added sections default to node 0 */
-	if (pa >= (max_pfn << PAGE_SHIFT))
-		return 0;
-#endif
-	nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
-
-#ifdef DEBUG_NUMA
-	/* the physical address passed in is not in the map for the system */
-	if (nid == -1) {
-		printk("bad address: %lx\n", pa);
-		BUG();
-	}
-#endif
-
-	return nid;
-}
-
-#define node_localnr(pfn, nid)	((pfn) - NODE_DATA(nid)->node_start_pfn)
-
 /*
  * Following are macros that each numa implmentation must define.
  */
@@ -75,39 +41,10 @@ static inline int pa_to_nid(unsigned long pa)
 #define node_start_pfn(nid)	(NODE_DATA(nid)->node_start_pfn)
 #define node_end_pfn(nid)	(NODE_DATA(nid)->node_end_pfn)
 
-#ifdef CONFIG_DISCONTIGMEM
-
-/*
- * Given a kernel address, find the home node of the underlying memory.
- */
-#define kvaddr_to_nid(kaddr)	pa_to_nid(__pa(kaddr))
-
-#define pfn_to_nid(pfn)		pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
-
-/* Written this way to avoid evaluating arguments twice */
-#define discontigmem_pfn_to_page(pfn) \
-({ \
-	unsigned long __tmp = pfn; \
-	(NODE_DATA(pfn_to_nid(__tmp))->node_mem_map + \
-	 node_localnr(__tmp, pfn_to_nid(__tmp))); \
-})
-
-#define discontigmem_page_to_pfn(p) \
-({ \
-	struct page *__tmp = p; \
-	(((__tmp) - page_zone(__tmp)->zone_mem_map) + \
-	 page_zone(__tmp)->zone_start_pfn); \
-})
-
-/* XXX fix for discontiguous physical memory */
-#define discontigmem_pfn_valid(pfn)		((pfn) < num_physpages)
-
-#endif /* CONFIG_DISCONTIGMEM */
-
 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 
 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
-#define early_pfn_to_nid(pfn)  pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
+extern int __init early_pfn_to_nid(unsigned long pfn);
 #endif
 
 #endif /* _ASM_MMZONE_H_ */

include/asm-ppc64/page.h

@@ -279,11 +279,6 @@ extern u64 ppc64_pft_size;		/* Log 2 of page table size */
 
 #define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
 
-#ifdef CONFIG_DISCONTIGMEM
-#define page_to_pfn(page)	discontigmem_page_to_pfn(page)
-#define pfn_to_page(pfn)	discontigmem_pfn_to_page(pfn)
-#define pfn_valid(pfn)		discontigmem_pfn_valid(pfn)
-#endif
 #ifdef CONFIG_FLATMEM
 #define pfn_to_page(pfn)	(mem_map + (pfn))
 #define page_to_pfn(page)	((unsigned long)((page) - mem_map))