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authorwdenk <wdenk>2004-02-08 19:38:38 +0000
committerwdenk <wdenk>2004-02-08 19:38:38 +0000
commitf6e20fc6ca5a45316f94743d8b60dce4d9766bc8 (patch)
treecdea7c7227b937ff231d98e50e64b6fa447bacda /cpu/ixp
parentf4863a7aec41f1f78fe93eade700b15b287a5ef7 (diff)
Patch by Anders Larsen, 09 Jan 2004:
ARM memory layout fixes: the abort-stack is now set up in the correct RAM area, and the BSS is zeroed out as it should be. Furthermore, the magic variables 'armboot_end' and 'armboot_end_data' of the linker scripts are replaced by '__bss_start' and '_end', resp., which is a further step to eliminate unnecessary differences between the implementation of the CPU architectures.
Diffstat (limited to 'cpu/ixp')
-rw-r--r--cpu/ixp/cpu.c22
-rw-r--r--cpu/ixp/start.S60
2 files changed, 24 insertions, 58 deletions
diff --git a/cpu/ixp/cpu.c b/cpu/ixp/cpu.c
index d12e8bd6c27..d4fd823d6da 100644
--- a/cpu/ixp/cpu.c
+++ b/cpu/ixp/cpu.c
@@ -37,22 +37,16 @@
int cpu_init (void)
{
/*
- * setup up stack if necessary
+ * setup up stacks if necessary
*/
-/*
-
- FIXME: the stack is _below_ the uboot code!!
-
#ifdef CONFIG_USE_IRQ
- IRQ_STACK_START = _armboot_end +
- CONFIG_STACKSIZE + CONFIG_STACKSIZE_IRQ - 4;
- FIQ_STACK_START = IRQ_STACK_START + CONFIG_STACKSIZE_FIQ;
- _armboot_real_end = FIQ_STACK_START + 4;
-#else
- _armboot_real_end = _armboot_end + CONFIG_STACKSIZE;
+ DECLARE_GLOBAL_DATA_PTR;
+
+ IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
+ FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
#endif
-*/
- pci_init();
+
+ pci_init();
return 0;
}
@@ -84,7 +78,7 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
extern void reset_cpu (ulong addr);
- printf ("reseting ...\n");
+ printf ("resetting ...\n");
udelay (50000); /* wait 50 ms */
disable_interrupts ();
diff --git a/cpu/ixp/start.S b/cpu/ixp/start.S
index d5fc9bf6425..09ecc73a00c 100644
--- a/cpu/ixp/start.S
+++ b/cpu/ixp/start.S
@@ -101,42 +101,15 @@ _armboot_start:
.word _start
/*
- * Note: _armboot_end_data and _armboot_end are defined
- * by the (board-dependent) linker script.
- * _armboot_end_data is the first usable FLASH address after armboot
- */
-.globl _armboot_end_data
-_armboot_end_data:
- .word armboot_end_data
-.globl _armboot_end
-_armboot_end:
- .word armboot_end
-
-/*
- * This is defined in the board specific linker script
+ * These are defined in the board-specific linker script.
*/
.globl _bss_start
_bss_start:
- .word bss_start
+ .word __bss_start
.globl _bss_end
_bss_end:
- .word bss_end
-
-/*
- * _armboot_real_end is the first usable RAM address behind armboot
- * and the various stacks
- */
-.globl _armboot_real_end
-_armboot_real_end:
- .word 0x0badc0de
-
-/*
- * We relocate uboot to this address (end of RAM - 128 KiB)
- */
-.globl _uboot_reloc
-_uboot_reloc:
- .word TEXT_BASE
+ .word _end
#ifdef CONFIG_USE_IRQ
/* IRQ stack memory (calculated at run-time) */
@@ -294,7 +267,7 @@ relocate: /* relocate U-Boot to RAM */
beq stack_setup
ldr r2, _armboot_start
- ldr r3, _armboot_end
+ ldr r3, _bss_start
sub r2, r3, r2 /* r2 <- size of armboot */
add r2, r0, r2 /* r2 <- source end address */
@@ -305,16 +278,16 @@ copy_loop:
ble copy_loop
/* Set up the stack */
-
stack_setup:
-
- ldr r0, _uboot_reloc /* upper 128 KiB: relocated uboot */
- sub r0, r0, #CFG_MALLOC_LEN /* malloc area */
- /* FIXME: bdinfo should be here */
+ ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
+ sub r0, r0, #CFG_MALLOC_LEN /* malloc area */
+ sub r0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */
+#ifdef CONFIG_USE_IRQ
+ sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
+#endif
sub sp, r0, #12 /* leave 3 words for abort-stack */
clear_bss:
-
ldr r0, _bss_start /* find start of bss segment */
add r0, r0, #4 /* start at first byte of bss */
ldr r1, _bss_end /* stop here */
@@ -325,7 +298,6 @@ clbss_l:str r2, [r0] /* clear loop... */
cmp r0, r1
bne clbss_l
-
ldr pc, _start_armboot
_start_armboot: .word start_armboot
@@ -370,9 +342,9 @@ _start_armboot: .word start_armboot
stmia sp, {r0 - r12} /* Calling r0-r12 */
add r8, sp, #S_PC
- ldr r2, _armboot_end
- add r2, r2, #CONFIG_STACKSIZE
- sub r2, r2, #8
+ ldr r2, _armboot_start
+ sub r2, r2, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
ldmia r2, {r2 - r4} /* get pc, cpsr, old_r0 */
add r0, sp, #S_FRAME_SIZE /* restore sp_SVC */
@@ -407,9 +379,9 @@ _start_armboot: .word start_armboot
.endm
.macro get_bad_stack
- ldr r13, _armboot_end @ setup our mode stack
- add r13, r13, #CONFIG_STACKSIZE @ resides at top of normal stack
- sub r13, r13, #8
+ ldr r13, _armboot_start @ setup our mode stack
+ sub r13, r13, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r13, r13, #(CFG_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
str lr, [r13] @ save caller lr / spsr
mrs lr, spsr