Commit 5761eaa3 authored by Geoff Levand's avatar Geoff Levand Committed by Paul Mackerras
Browse files

[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: default avatarGeoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 23afcb4e

arch/powerpc/boot/ps3-head.S

+16 −9
Original line number Diff line number Diff line
@@ -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

arch/powerpc/boot/ps3.c

+15 −8
Original line number Diff line number Diff line
@@ -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();

arch/powerpc/boot/wrapper

+11 −10
Original line number Diff line number Diff line
@@ -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"

CRA Git | Maintained and supported by SUSTech CRA and CCSE