[patch 3/6] PS3: Bootwrapper improvements
Geoff Levand
geoffrey.levand at am.sony.com
Thu Mar 27 11:38:14 EST 2008
Improve the debuging support of the PS3 bootwraper code:
o Increase the size of the PS3 bootwrapper overlay from 256 to 512 bytes to
allow for more debugging code in the overlay.
o Use the dot symbol to set the size of __system_reset_overlay. The
asembler will then emit an error if the overlay code is too big.
o Remove some unused instructions.
o Update the text describing the PS3 bootwrapper overlay.
o Add a check for null pointer writes.
o Change hcall return value from s64.
Signed-off-by: Geoff Levand <geoffrey.levand at am.sony.com>
---
arch/powerpc/boot/ps3-head.S | 25 ++++++++++++++++---------
arch/powerpc/boot/ps3.c | 21 +++++++++++++--------
arch/powerpc/boot/wrapper | 21 +++++++++++----------
3 files changed, 40 insertions(+), 27 deletions(-)
--- a/arch/powerpc/boot/ps3-head.S
+++ b/arch/powerpc/boot/ps3-head.S
@@ -27,8 +27,9 @@
/*
* __system_reset_overlay - The PS3 first stage entry.
*
- * The bootwraper build script copies the 0x100 bytes at symbol
- * __system_reset_overlay to offset 0x100 of the rom image.
+ * The bootwraper build script copies the 512 bytes at symbol
+ * __system_reset_overlay to offset 0x100 of the rom image. This symbol
+ * must occupy 512 or less bytes.
*
* The PS3 has a single processor with two threads.
*/
@@ -47,8 +48,6 @@ __system_reset_overlay:
mfspr r3, 0x88
cntlzw. r3, r3
- li r4, 0
- li r5, 0
beq 1f
/* Secondary goes to __secondary_hold in kernel. */
@@ -57,8 +56,14 @@ __system_reset_overlay:
mtctr r4
bctr
- /* Primary delays then goes to _zimage_start in wrapper. */
1:
+ /* Save the value at addr zero for a null pointer write check later. */
+
+ li r4, 0
+ lwz r3, 0(r4)
+
+ /* Primary delays then goes to _zimage_start in wrapper. */
+
or 31, 31, 31 /* db16cyc */
or 31, 31, 31 /* db16cyc */
@@ -67,16 +72,18 @@ __system_reset_overlay:
mtctr r4
bctr
+ . = __system_reset_overlay + 512
+
/*
* __system_reset_kernel - Place holder for the kernel reset vector.
*
- * The bootwrapper build script copies 0x100 bytes from offset 0x100
+ * The bootwrapper build script copies 512 bytes from offset 0x100
* of the rom image to the symbol __system_reset_kernel. At runtime
- * the bootwrapper program copies the 0x100 bytes at __system_reset_kernel
- * to ram address 0x100. This symbol must occupy 0x100 bytes.
+ * the bootwrapper program copies the 512 bytes at __system_reset_kernel
+ * to ram address 0x100. This symbol must occupy 512 bytes.
*/
.globl __system_reset_kernel
__system_reset_kernel:
- . = __system_reset_kernel + 0x100
+ . = __system_reset_kernel + 512
--- a/arch/powerpc/boot/ps3.c
+++ b/arch/powerpc/boot/ps3.c
@@ -27,10 +27,10 @@
#include "page.h"
#include "ops.h"
-extern s64 lv1_panic(u64 in_1);
-extern s64 lv1_get_logical_partition_id(u64 *out_1);
-extern s64 lv1_get_logical_ppe_id(u64 *out_1);
-extern s64 lv1_get_repository_node_value(u64 in_1, u64 in_2, u64 in_3,
+extern int lv1_panic(u64 in_1);
+extern int lv1_get_logical_partition_id(u64 *out_1);
+extern int lv1_get_logical_ppe_id(u64 *out_1);
+extern int lv1_get_repository_node_value(u64 in_1, u64 in_2, u64 in_3,
u64 in_4, u64 in_5, u64 *out_1, u64 *out_2);
#ifdef DEBUG
@@ -46,6 +46,7 @@ BSS_STACK(4096);
* edit the command line passed to vmlinux (by setting /chosen/bootargs).
* The buffer is put in it's own section so that tools may locate it easier.
*/
+
static char cmdline[COMMAND_LINE_SIZE]
__attribute__((__section__("__builtin_cmdline")));
@@ -75,7 +76,7 @@ static void ps3_exit(void)
static int ps3_repository_read_rm_size(u64 *rm_size)
{
- s64 result;
+ int result;
u64 lpar_id;
u64 ppe_id;
u64 v2;
@@ -114,11 +115,11 @@ void ps3_copy_vectors(void)
{
extern char __system_reset_kernel[];
- memcpy((void *)0x100, __system_reset_kernel, 0x100);
- flush_cache((void *)0x100, 0x100);
+ memcpy((void *)0x100, __system_reset_kernel, 512);
+ flush_cache((void *)0x100, 512);
}
-void platform_init(void)
+void platform_init(unsigned long null_check)
{
const u32 heapsize = 0x1000000 - (u32)_end; /* 16MiB */
void *chosen;
@@ -151,6 +152,10 @@ void platform_init(void)
printf(" flat tree at 0x%lx\n\r", ft_addr);
+ if (*(unsigned long *)0 != null_check)
+ printf("null check failed: %lx != %lx\n\r", *(unsigned long *)0,
+ (unsigned long)null_check);
+
((kernel_entry_t)0)(ft_addr, 0, NULL);
ps3_exit();
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -298,15 +298,16 @@ treeboot*)
exit 0
;;
ps3)
- # The ps3's loader supports loading gzipped binary images from flash
- # rom to addr zero. The loader enters the image at addr 0x100. A
- # bootwrapper overlay is use to arrange for the kernel to be loaded
- # to addr zero and to have a suitable bootwrapper entry at 0x100.
- # To construct the rom image, 0x100 bytes from offset 0x100 in the
- # kernel is copied to the bootwrapper symbol __system_reset_kernel.
- # The 0x100 bytes at the bootwrapper symbol __system_reset_overlay is
- # then copied to offset 0x100. At runtime the bootwrapper program
- # copies the 0x100 bytes at __system_reset_kernel to addr 0x100.
+ # The ps3's loader supports loading a gzipped binary image from flash
+ # rom to ram addr zero. The loader then enters the system reset
+ # vector at addr 0x100. A bootwrapper overlay is used to arrange for
+ # a binary image of the kernel to be at addr zero, and yet have a
+ # suitable bootwrapper entry at 0x100. To construct the final rom
+ # image 512 bytes from offset 0x100 is copied to the bootwrapper
+ # place holder at symbol __system_reset_kernel. The 512 bytes of the
+ # bootwrapper entry code at symbol __system_reset_overlay is then
+ # copied to offset 0x100. At runtime the bootwrapper program copies
+ # the data at __system_reset_kernel back to addr 0x100.
system_reset_overlay=0x`${CROSS}nm "$ofile" \
| grep ' __system_reset_overlay$' \
@@ -317,7 +318,7 @@ ps3)
| cut -d' ' -f1`
system_reset_kernel=`printf "%d" $system_reset_kernel`
overlay_dest="256"
- overlay_size="256"
+ overlay_size="512"
${CROSS}objcopy -O binary "$ofile" "$ofile.bin"
--
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