Commit 740a3e67 authored by Paul Mundt's avatar Paul Mundt

sh: Enable skipping of bss on debug platforms for sh32 also.

This enables the same functionality that sh64 has for sh32. When running
on simulated hardware or via remote memory via the debug interface,
memory is gauranteed to be zero on boot already, and skipping the zeroing
of BSS has measurable boot time benefits.
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 8a655053
...@@ -98,6 +98,18 @@ config IRQSTACKS ...@@ -98,6 +98,18 @@ config IRQSTACKS
for handling hard and soft interrupts. This can help avoid for handling hard and soft interrupts. This can help avoid
overflowing the process kernel stacks. overflowing the process kernel stacks.
config SH_NO_BSS_INIT
bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
depends on DEBUG_KERNEL
default n
help
If running in painfully slow environments, such as an RTL
simulation or from remote memory via SHdebug, where the memory
can already be gauranteed to ber zeroed on boot, say Y.
For all other cases, say N. If this option seems perplexing, or
you aren't sure, say N.
config MORE_COMPILE_OPTIONS config MORE_COMPILE_OPTIONS
bool "Add any additional compile options" bool "Add any additional compile options"
help help
...@@ -125,9 +137,6 @@ config SH_ALPHANUMERIC ...@@ -125,9 +137,6 @@ config SH_ALPHANUMERIC
bool "Enable debug outputs to on-board alphanumeric display" bool "Enable debug outputs to on-board alphanumeric display"
depends on SH_CAYMAN depends on SH_CAYMAN
config SH_NO_BSS_INIT
bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
endif endif
endmenu endmenu
...@@ -81,6 +81,12 @@ ENTRY(_stext) ...@@ -81,6 +81,12 @@ ENTRY(_stext)
ldc r0, r7_bank ! ... and initial thread_info ldc r0, r7_bank ! ... and initial thread_info
#endif #endif
#ifndef CONFIG_SH_NO_BSS_INIT
/*
* Don't clear BSS if running on slow platforms such as an RTL simulation,
* remote memory via SHdebug link, etc. For these the memory can be guaranteed
* to be all zero on boot anyway.
*/
! Clear BSS area ! Clear BSS area
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
mov.l 3f, r0 mov.l 3f, r0
...@@ -97,6 +103,8 @@ ENTRY(_stext) ...@@ -97,6 +103,8 @@ ENTRY(_stext)
mov.l r0,@-r2 mov.l r0,@-r2
10: 10:
#endif
! Additional CPU initialization ! Additional CPU initialization
mov.l 6f, r0 mov.l 6f, r0
jsr @r0 jsr @r0
......
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