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Ingenic Jz4740: put stack in IRAM & optimize/clean up crt0.S a bit

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20742 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Maurus Cuelenaere 2009-04-19 15:16:37 +00:00
parent dc8db2a820
commit c147d39bb5
2 changed files with 39 additions and 45 deletions
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22
firmware/target/mips/ingenic_jz47xx/app.lds
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@ -60,16 +60,6 @@ SECTIONS
. = ALIGN(4); . = ALIGN(4);
.stack (NOLOAD):
{
*(.stack);
stackbegin = .;
. += 0x2000;
stackend = .;
} > DRAM
. = ALIGN(4);
/* Set the load address of .iram at the same address as .bss /* Set the load address of .iram at the same address as .bss
* so RAM won't be wasted as .iram in the end will get copied * so RAM won't be wasted as .iram in the end will get copied
* to IRAM. */ * to IRAM. */
@ -96,6 +86,16 @@ SECTIONS
. = ALIGN(4); . = ALIGN(4);
.stack (NOLOAD):
{
*(.stack);
stackbegin = .;
. += 0x2000;
stackend = .;
} > IRAM
. = ALIGN(4);
.bss (NOLOAD): .bss (NOLOAD):
{ {
_edata = .; _edata = .;
@ -123,7 +123,7 @@ SECTIONS
.audiobufend ENDAUDIOADDR: .audiobufend ENDAUDIOADDR:
{ {
audiobufend = .; audiobufend = .;
} > DRAM }
.codec ENDAUDIOADDR: .codec ENDAUDIOADDR:
{ {

60
firmware/target/mips/ingenic_jz47xx/crt0.S
View file

@ -40,13 +40,12 @@
.text .text
.set mips32
.extern system_main .extern system_main
.extern main .extern main
.global _start .global _start
.section .init.text .section .init.text
.set mips32
.set noreorder .set noreorder
.set noat .set noat
@ -102,10 +101,10 @@ _start:
mtc0 zero, C0_TAGLO # TAGLO reg mtc0 zero, C0_TAGLO # TAGLO reg
mtc0 zero, C0_TAGHI # TAGHI reg mtc0 zero, C0_TAGHI # TAGHI reg
_init_cache_loop: _cache_loop:
cache 0x8, 0(t0) # index store icache tag cache 0x8, 0(t0) # index store icache tag
cache 0x9, 0(t0) # index store dcache tag cache 0x9, 0(t0) # index store dcache tag
bne t0, t1, _init_cache_loop bne t0, t1, _cache_loop
addiu t0, t0, 0x20 # 32 bytes per cache line addiu t0, t0, 0x20 # 32 bytes per cache line
nop nop
@ -130,11 +129,11 @@ _init_cache_loop:
la t0, _iramcopy la t0, _iramcopy
la t1, _iramstart la t1, _iramstart
la t2, _iramend la t2, _iramend
_init_iram_loop: _iram_loop:
lw t3, 0(t0) lw t3, 0(t0)
sw t3, 0(t1) sw t3, 0(t1)
addiu t1, 4 addiu t1, 4
bne t1, t2, _init_iram_loop bne t1, t2, _iram_loop
addiu t0, 4 addiu t0, 4
/* /*
@ -144,9 +143,9 @@ _init_iram_loop:
*/ */
la t0, _edata la t0, _edata
la t1, _end la t1, _end
_init_bss_loop: _bss_loop:
sw zero, 0(t0) sw zero, 0(t0)
bne t0, t1, _init_bss_loop bne t0, t1, _bss_loop
addiu t0, 4 addiu t0, 4
/* /*
@ -156,23 +155,23 @@ _init_bss_loop:
*/ */
la t0, _iedata la t0, _iedata
la t1, _iend la t1, _iend
_init_ibss_loop: _ibss_loop:
sw zero, 0(t0) sw zero, 0(t0)
bne t0, t1, _init_ibss_loop bne t0, t1, _ibss_loop
addiu t0, 4 addiu t0, 4
/* /*
---------------------------------------------------- ----------------------------------------------------
Setup stack Set up stack
---------------------------------------------------- ----------------------------------------------------
*/ */
la sp, stackend la sp, stackend
la t0, stackbegin la t0, stackbegin
li t1, 0xDEADBEEF li t1, 0xDEADBEEF
_init_stack_loop: _stack_loop:
sw t1, 0(t0) sw t1, 0(t0)
bne t0, sp, _init_stack_loop bne t0, sp, _stack_loop
addiu t0, t0, 4 addiu t0, t0, 4
/* /*
@ -180,11 +179,9 @@ _init_stack_loop:
Jump to C code Jump to C code
---------------------------------------------------- ----------------------------------------------------
*/ */
la t0, system_main /* Init clocks etc first */ jal system_main /* Init clocks etc first */
jalr t0
nop nop
la t0, main j main
jr t0
nop nop
@ -196,23 +193,19 @@ _init_stack_loop:
*/ */
.section .vectors.1, "ax", %progbits .section .vectors.1, "ax", %progbits
la k0, tlb_refill_handler j tlb_refill_handler
jr k0
nop nop
.section .vectors.2, "ax", %progbits .section .vectors.2, "ax", %progbits
la k0, real_exception_handler j real_exception_handler
jr k0
nop nop
.section .vectors.3, "ax", %progbits .section .vectors.3, "ax", %progbits
la k0, real_exception_handler j real_exception_handler
jr k0
nop nop
.section .vectors.4, "ax", %progbits .section .vectors.4, "ax", %progbits
la k0, real_exception_handler j real_exception_handler
jr k0
nop nop
.section .vectors, "ax", %progbits .section .vectors, "ax", %progbits
@ -252,13 +245,13 @@ real_exception_handler:
mfhi k0 mfhi k0
nop nop
sw k0, 0x74(sp) sw k0, 0x74(sp)
mfc0 k0, C0_STATUS # Status register mfc0 k0, C0_STATUS
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sw k0, 0x78(sp) sw k0, 0x78(sp)
mfc0 k0, C0_EPC # Exception Program Counter mfc0 k0, C0_EPC
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
@ -266,7 +259,7 @@ real_exception_handler:
sw k0, 0x7C(sp) sw k0, 0x7C(sp)
li k1, M_CauseExcCode li k1, M_CauseExcCode
mfc0 k0, C0_CAUSE # C0_CAUSE of last exception mfc0 k0, C0_CAUSE
and k0, k1 and k0, k1
beq zero, k0, _int beq zero, k0, _int
nop nop
@ -280,12 +273,12 @@ _int:
_exception: _exception:
move a0, sp move a0, sp
mfc0 a1, C0_CAUSE # C0_CAUSE of last exception mfc0 a1, C0_CAUSE
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
mfc0 a2, C0_EPC # Exception Program Counter mfc0 a2, C0_EPC
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
@ -329,20 +322,21 @@ _exception_return:
mthi k0 mthi k0
nop nop
lw k0, 0x78(sp) lw k0, 0x78(sp)
mtc0 k0, C0_STATUS # Status register mtc0 k0, C0_STATUS
nop nop
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
lw k0, 0x7C(sp) lw k0, 0x7C(sp)
mtc0 k0, C0_EPC # Exception Program Counter mtc0 k0, C0_EPC
nop nop
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
sll zero, 1 sll zero, 1
addiu sp, 0x80 addiu sp, 0x80
eret # Exception Return eret
nop nop
.set reorder .set reorder
.set at