diff options
Diffstat (limited to 'cpu/arm1136/start.S')
| -rw-r--r-- | cpu/arm1136/start.S | 154 |
1 files changed, 77 insertions, 77 deletions
diff --git a/cpu/arm1136/start.S b/cpu/arm1136/start.S index 826c27e..8cacc16 100644 --- a/cpu/arm1136/start.S +++ b/cpu/arm1136/start.S @@ -1,7 +1,7 @@ /* * armboot - Startup Code for OMP2420/ARM1136 CPU-core * - * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com> + * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com> * * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> @@ -19,7 +19,7 @@ * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License @@ -33,7 +33,7 @@ #include <asm/arch/omap2420.h> .globl _start -_start: b reset +_start: b reset ldr pc, _undefined_instruction ldr pc, _software_interrupt ldr pc, _prefetch_abort @@ -42,14 +42,14 @@ _start: b reset ldr pc, _irq ldr pc, _fiq -_undefined_instruction: .word undefined_instruction +_undefined_instruction: .word undefined_instruction _software_interrupt: .word software_interrupt _prefetch_abort: .word prefetch_abort _data_abort: .word data_abort _not_used: .word not_used _irq: .word irq _fiq: .word fiq -_pad: .word 0x12345678 /* now 16*4=64 */ +_pad: .word 0x12345678 /* now 16*4=64 */ .global _end_vect _end_vect: @@ -111,22 +111,22 @@ reset: msr cpsr,r0 #ifdef CONFIG_OMAP2420H4 - /* Copy vectors to mask ROM indirect addr */ - adr r0, _start /* r0 <- current position of code */ - mov r2, #64 /* r2 <- size to copy */ - add r2, r0, r2 /* r2 <- source end address */ - mov r1, #SRAM_OFFSET0 /* build vect addr */ - mov r3, #SRAM_OFFSET1 - add r1, r1, r3 - mov r3, #SRAM_OFFSET2 - add r1, r1, r3 + /* Copy vectors to mask ROM indirect addr */ + adr r0, _start /* r0 <- current position of code */ + mov r2, #64 /* r2 <- size to copy */ + add r2, r0, r2 /* r2 <- source end address */ + mov r1, #SRAM_OFFSET0 /* build vect addr */ + mov r3, #SRAM_OFFSET1 + add r1, r1, r3 + mov r3, #SRAM_OFFSET2 + add r1, r1, r3 next: - ldmia r0!, {r3-r10} /* copy from source address [r0] */ - stmia r1!, {r3-r10} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - bne next /* loop until equal */ + ldmia r0!, {r3-r10} /* copy from source address [r0] */ + stmia r1!, {r3-r10} /* copy to target address [r1] */ + cmp r0, r2 /* until source end address [r2] */ + bne next /* loop until equal */ #ifdef CONFIG_PARTIAL_SRAM - bl cpy_clk_code /* put dpll adjust code behind vectors */ + bl cpy_clk_code /* put dpll adjust code behind vectors */ #endif #endif /* the mask ROM code should have PLL and others stable */ @@ -135,13 +135,13 @@ next: relocate: /* relocate U-Boot to RAM */ adr r0, _start /* r0 <- current position of code */ ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ - cmp r0, r1 /* don't reloc during debug */ - beq stack_setup + cmp r0, r1 /* don't reloc during debug */ + beq stack_setup ldr r2, _armboot_start ldr r3, _bss_start - sub r2, r3, r2 /* r2 <- size of armboot */ - add r2, r0, r2 /* r2 <- source end address */ + sub r2, r3, r2 /* r2 <- size of armboot */ + add r2, r0, r2 /* r2 <- source end address */ copy_loop: ldmia r0!, {r3-r10} /* copy from source address [r0] */ @@ -152,26 +152,26 @@ copy_loop: /* Set up the stack */ stack_setup: 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 */ + 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 */ - ldr r1, _bss_end /* stop here */ - mov r2, #0x00000000 /* clear */ + ldr r0, _bss_start /* find start of bss segment */ + ldr r1, _bss_end /* stop here */ + mov r2, #0x00000000 /* clear */ -clbss_l:str r2, [r0] /* clear loop... */ +clbss_l:str r2, [r0] /* clear loop... */ add r0, r0, #4 cmp r0, r1 bne clbss_l ldr pc, _start_armboot -_start_armboot: .word start_armboot +_start_armboot: .word start_armboot /* @@ -205,18 +205,18 @@ cpu_init_crit: mcr p15, 0, r0, c1, c0, 0 /* - * Jump to board specific initialization... The Mask ROM will have already initialized - * basic memory. Go here to bump up clock rate and handle wake up conditions. + * Jump to board specific initialization... The Mask ROM will have already initialized + * basic memory. Go here to bump up clock rate and handle wake up conditions. */ adr r0, _start /* r0 <- current position of code */ ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ - cmp r0, r1 /* pass on info about skipping some init portions */ - moveq r0,#0x1 /* flag to skip prcm and sdrc setup */ - movne r0,#0x0 - mov ip, lr /* persevere link reg across call */ - bl platformsetup /* go setup pll,mux,memory */ - mov lr, ip /* restore link */ - mov pc, lr /* back to my caller */ + cmp r0, r1 /* pass on info about skipping some init portions */ + moveq r0,#0x1 /* flag to skip prcm and sdrc setup */ + movne r0,#0x0 + mov ip, lr /* persevere link reg across call */ + bl platformsetup /* go setup pll,mux,memory */ + mov lr, ip /* restore link */ + mov pc, lr /* back to my caller */ /* ************************************************************************* * @@ -258,30 +258,30 @@ cpu_init_crit: */ .macro bad_save_user_regs - sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack + sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12 ldr r2, _armboot_start sub r2, r2, #(CFG_MALLOC_LEN) - sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack - ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs) + sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack + ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs) add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack add r5, sp, #S_SP mov r1, lr - stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr - mov r0, sp @ save current stack into r0 (param register) + stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr + mov r0, sp @ save current stack into r0 (param register) .endm .macro irq_save_user_regs sub sp, sp, #S_FRAME_SIZE stmia sp, {r0 - r12} @ Calling r0-r12 - add r8, sp, #S_PC @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good. - stmdb r8, {sp, lr}^ @ Calling SP, LR - str lr, [r8, #0] @ Save calling PC - mrs r6, spsr - str r6, [r8, #4] @ Save CPSR - str r0, [r8, #8] @ Save OLD_R0 + add r8, sp, #S_PC @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good. + stmdb r8, {sp, lr}^ @ Calling SP, LR + str lr, [r8, #0] @ Save calling PC + mrs r6, spsr + str r6, [r8, #4] @ Save CPSR + str r0, [r8, #8] @ Save OLD_R0 mov r0, sp .endm @@ -295,31 +295,31 @@ cpu_init_crit: .macro get_bad_stack ldr r13, _armboot_start @ setup our mode stack (enter in banked mode) - sub r13, r13, #(CFG_MALLOC_LEN) @ move past malloc pool + sub r13, r13, #(CFG_MALLOC_LEN) @ move past malloc pool sub r13, r13, #(CFG_GBL_DATA_SIZE+8) @ move to reserved a couple spots for abort stack str lr, [r13] @ save caller lr in position 0 of saved stack - mrs lr, spsr @ get the spsr - str lr, [r13, #4] @ save spsr in position 1 of saved stack + mrs lr, spsr @ get the spsr + str lr, [r13, #4] @ save spsr in position 1 of saved stack mov r13, #MODE_SVC @ prepare SVC-Mode @ msr spsr_c, r13 - msr spsr, r13 @ switch modes, make sure moves will execute - mov lr, pc @ capture return pc - movs pc, lr @ jump to next instruction & switch modes. + msr spsr, r13 @ switch modes, make sure moves will execute + mov lr, pc @ capture return pc + movs pc, lr @ jump to next instruction & switch modes. .endm .macro get_bad_stack_swi - sub r13, r13, #4 @ space on current stack for scratch reg. - str r0, [r13] @ save R0's value. + sub r13, r13, #4 @ space on current stack for scratch reg. + str r0, [r13] @ save R0's value. ldr r0, _armboot_start @ get data regions start - sub r0, r0, #(CFG_MALLOC_LEN) @ move past malloc pool - sub r0, r0, #(CFG_GBL_DATA_SIZE+8) @ move past gbl and a couple spots for abort stack + sub r0, r0, #(CFG_MALLOC_LEN) @ move past malloc pool + sub r0, r0, #(CFG_GBL_DATA_SIZE+8) @ move past gbl and a couple spots for abort stack str lr, [r0] @ save caller lr in position 0 of saved stack - mrs r0, spsr @ get the spsr - str lr, [r0, #4] @ save spsr in position 1 of saved stack - ldr r0, [r13] @ restore r0 - add r13, r13, #4 @ pop stack entry + mrs r0, spsr @ get the spsr + str lr, [r0, #4] @ save spsr in position 1 of saved stack + ldr r0, [r13] @ restore r0 + add r13, r13, #4 @ pop stack entry .endm .macro get_irq_stack @ setup IRQ stack @@ -333,35 +333,35 @@ cpu_init_crit: /* * exception handlers */ - .align 5 + .align 5 undefined_instruction: get_bad_stack bad_save_user_regs - bl do_undefined_instruction + bl do_undefined_instruction .align 5 software_interrupt: get_bad_stack_swi bad_save_user_regs - bl do_software_interrupt + bl do_software_interrupt .align 5 prefetch_abort: get_bad_stack bad_save_user_regs - bl do_prefetch_abort + bl do_prefetch_abort .align 5 data_abort: get_bad_stack bad_save_user_regs - bl do_data_abort + bl do_data_abort .align 5 not_used: get_bad_stack bad_save_user_regs - bl do_not_used + bl do_not_used #ifdef CONFIG_USE_IRQ @@ -369,7 +369,7 @@ not_used: irq: get_irq_stack irq_save_user_regs - bl do_irq + bl do_irq irq_restore_user_regs .align 5 @@ -377,7 +377,7 @@ fiq: get_fiq_stack /* someone ought to write a more effiction fiq_save_user_regs */ irq_save_user_regs - bl do_fiq + bl do_fiq irq_restore_user_regs #else @@ -386,13 +386,13 @@ fiq: irq: get_bad_stack bad_save_user_regs - bl do_irq + bl do_irq .align 5 fiq: get_bad_stack bad_save_user_regs - bl do_fiq + bl do_fiq #endif .align 5 @@ -404,9 +404,9 @@ arm1136_cache_flush: .align 5 .globl reset_cpu reset_cpu: - ldr r1, rstctl /* get addr for global reset reg */ - mov r3, #0x3 /* full reset pll+mpu */ - str r3, [r1] /* force reset */ + ldr r1, rstctl /* get addr for global reset reg */ + mov r3, #0x3 /* full reset pll+mpu */ + str r3, [r1] /* force reset */ mov r0, r0 _loop_forever: b _loop_forever |