[POWERPC] PS3: Bootwrapper improvements

Improve the debugging 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
   assembler 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@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Geoff Levand 2008-03-28 07:41:45 +11:00 committed by Paul Mackerras
parent 23afcb4e00
commit 5761eaa3a5
3 changed files with 42 additions and 27 deletions

View file

@ -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

View file

@ -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;
@ -114,16 +115,17 @@ 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;
unsigned long ft_addr;
u64 rm_size;
unsigned long val;
console_ops.write = ps3_console_write;
platform_ops.exit = ps3_exit;
@ -151,6 +153,11 @@ void platform_init(void)
printf(" flat tree at 0x%lx\n\r", ft_addr);
val = *(unsigned long *)0;
if (val != null_check)
printf("null check failed: %lx != %lx\n\r", val, null_check);
((kernel_entry_t)0)(ft_addr, 0, NULL);
ps3_exit();

View file

@ -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"