diff options
Diffstat (limited to 'c/src/lib/libbsp/mips/rbtx4938/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/mips/rbtx4938/start/start.S | 64 |
1 files changed, 32 insertions, 32 deletions
diff --git a/c/src/lib/libbsp/mips/rbtx4938/start/start.S b/c/src/lib/libbsp/mips/rbtx4938/start/start.S index c0f5ec55e9..735fd923ab 100644 --- a/c/src/lib/libbsp/mips/rbtx4938/start/start.S +++ b/c/src/lib/libbsp/mips/rbtx4938/start/start.S @@ -21,7 +21,7 @@ COPYRIGHT IDT CORPORATION 1996 LICENSED MATERIAL - PROGRAM PROPERTY OF IDT $Id$ -*/ +*/ /************************************************************************* ** @@ -42,9 +42,9 @@ LICENSED MATERIAL - PROGRAM PROPERTY OF IDT /* The following include file was deprecated */ /* #include <idtmon.h> */ - .extern mon_flush_cache + .extern mon_flush_cache -#if 0 +#if 0 .extern _fdata,4 /* this is defined by the linker */ .extern _edata,4 /* this is defined by the linker */ .extern _idata,4 /* this is defined by the linker */ @@ -59,11 +59,11 @@ LICENSED MATERIAL - PROGRAM PROPERTY OF IDT #define HARD_CODED_MEM_SIZE 0x1000000 /* RBTX4938 has 16 megabytes of RAM */ #define PMON_VECTOR 0xbfc00500 -#define TMP_STKSIZE 1024 +#define TMP_STKSIZE 1024 /* -** P_STACKSIZE is the size of the Prom Stack. -** the prom stack grows downward +** P_STACKSIZE is the size of the Prom Stack. +** the prom stack grows downward */ #define P_STACKSIZE 0x2000 /* sets stack size to 8k */ @@ -78,7 +78,7 @@ LICENSED MATERIAL - PROGRAM PROPERTY OF IDT ** c) Clear all IntMask Enables ** d) Set kernel/disabled mode ** 2) Initialize Cause Register -** a) clear software interrupt bits +** a) clear software interrupt bits ** 3) Determine FPU installed or not ** if not, clear CoProcessor 1 usable bit ** 4) Initialize data areas. Clear bss area. @@ -90,15 +90,15 @@ LICENSED MATERIAL - PROGRAM PROPERTY OF IDT ** 9) Flush Instruction and Data caches ** 10) If there is a Translation Lookaside Buffer, Clear the TLB ** 11) Execute initialization code if the IDT/c library is to be used -** +** ** 12) Jump to user's "main()" ** 13) Jump to promexit ** -** IDT/C 5.x defines _R3000, IDT/C 6.x defines _R4000 internally. +** IDT/C 5.x defines _R3000, IDT/C 6.x defines _R4000 internally. ** This is used to mark code specific to R3xxx or R4xxx processors. -** IDT/C 6.x defines __mips to be the ISA level for which we're -** generating code. This is used to make sure the stack etc. is -** double word aligned, when using -mips3 (default) or -mips2, +** IDT/C 6.x defines __mips to be the ISA level for which we're +** generating code. This is used to make sure the stack etc. is +** double word aligned, when using -mips3 (default) or -mips2, ** when compiling with IDT/C6.x ** ***************************************************************************/ @@ -121,10 +121,10 @@ FRAME(start,sp,0,ra) mtc0 v0,C0_CONFIG /* -** check to see if a fpu is really plugged in +** check to see if a fpu is really plugged in */ li t3,0xaaaa5555 /* put a's and 5's in t3 */ - mtc1 t3,fp0 /* try to write them into fp0 */ + mtc1 t3,fp0 /* try to write them into fp0 */ mtc1 zero,fp1 /* try to write zero in fp */ mfc1 t0,fp0 mfc1 t1,fp1 @@ -142,7 +142,7 @@ FRAME(start,sp,0,ra) mtc0 v0, C0_SR /* reset status register */ 2: - la gp, _gp /* Initialize gp register (pointer to "small" data)*/ + la gp, _gp /* Initialize gp register (pointer to "small" data)*/ #if 0 /* Initialize data sections from "rom" copy */ @@ -162,7 +162,7 @@ FRAME(start,sp,0,ra) la v1,end /* end of bss */ 4: sw zero,0(v0) bltu v0,v1,4b - add v0,4 + add v0,4 /************************************************************************ @@ -175,7 +175,7 @@ FRAME(start,sp,0,ra) ** *************************************************************************/ /* For MIPS 3, we need to be sure that the stack is aligned on a - * double word boundary. + * double word boundary. */ andi t0, v0, 0x7 beqz t0, 11f /* Last three bits Zero, already aligned */ @@ -187,16 +187,16 @@ FRAME(start,sp,0,ra) add v1, v0, TMP_STKSIZE /* end of bss + length of tmp stack */ sub v1, v1, (4*4) /* overhead */ move sp, v1 /* set sp to top of stack */ -4: sw zero, 0(v0) +4: sw zero, 0(v0) bltu v0, v1, 4b /* clear out temp stack */ - add v0, 4 - -/* jal init_exc_vecs */ /* install exception handlers */ + add v0, 4 + +/* jal init_exc_vecs */ /* install exception handlers */ /* nop */ /* MUST do before memory probes */ /* Force processor into uncached space during memory/cache probes */ la v0, 5f - li v1, K1BASE + li v1, K1BASE or v0, v1 j v0 nop @@ -218,7 +218,7 @@ FRAME(start,sp,0,ra) move v0, a0 /* mem_size */ /* For MIPS 3, we need to be sure that the stack (and hence v0 - * here) is aligned on a double word boundary. + * here) is aligned on a double word boundary. */ andi t0, v0, 0x7 beqz t0, 12f /* Last three bits Zero, already aligned */ @@ -230,9 +230,9 @@ FRAME(start,sp,0,ra) /************************************************************************** ** -** Permanent Stack - now know top of memory, put permanent stack there +** Permanent Stack - now know top of memory, put permanent stack there ** -***************************************************************************/ +***************************************************************************/ la t2, _fbss /* cache mode as linked */ and t2, 0xF0000000 /* isolate segment */ @@ -246,9 +246,9 @@ FRAME(start,sp,0,ra) move v1, v0 subu v1, P_STACKSIZE /* clear requested stack size */ -7: sw zero, 0(v1) /* clear P_STACKSIZE stack */ +7: sw zero, 0(v1) /* clear P_STACKSIZE stack */ bltu v1,v0,7b - add v1, 4 + add v1, 4 /* Invalidate data cache*/ @@ -288,12 +288,12 @@ FRAME(start,sp,0,ra) 2: mtc0 t2, C0_CONFIG /* set C0_Config */ nop -/* Lock first 4k of PMON into instruction cache. This includes interrupt service code which +/* Lock first 4k of PMON into instruction cache. This includes interrupt service code which we don't want to run out of slow flash device. */ la t0,0x9fc00000 li t1, 0x1000 - + move t3, t0 addu t1, t0, t1 1: bge t0, t1, 2f @@ -316,7 +316,7 @@ FRAME(start,sp,0,ra) /* ** Clear Translation Lookaside Buffer (TLB) -*/ +*/ jal init_tlb /* clear the tlb */ /* @@ -333,7 +333,7 @@ FRAME(start,sp,0,ra) 1: beq zero,zero,1b nop - + ENDFRAME(start) /* @@ -351,7 +351,7 @@ FRAME(_sys_exit,sp,0,ra) 13: b 13b # but loop back just in-case nop - + ENDFRAME(_sys_exit) |