diff options
Diffstat (limited to 'arch/arm/cpu/lh7a40x/start.S')
| -rw-r--r-- | arch/arm/cpu/lh7a40x/start.S | 187 |
1 files changed, 186 insertions, 1 deletions
diff --git a/arch/arm/cpu/lh7a40x/start.S b/arch/arm/cpu/lh7a40x/start.S index 14a1fbe12..002116a40 100644 --- a/arch/arm/cpu/lh7a40x/start.S +++ b/arch/arm/cpu/lh7a40x/start.S @@ -72,12 +72,15 @@ _fiq: .word fiq ************************************************************************* */ +.globl _TEXT_BASE _TEXT_BASE: .word TEXT_BASE +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) .globl _armboot_start _armboot_start: .word _start +#endif /* * These are defined in the board-specific linker script. @@ -102,8 +105,182 @@ FIQ_STACK_START: .word 0x0badc0de #endif +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +/* IRQ stack memory (calculated at run-time) + 8 bytes */ +.globl IRQ_STACK_START_IN +IRQ_STACK_START_IN: + .word 0x0badc0de + +.globl _datarel_start +_datarel_start: + .word __datarel_start + +.globl _datarelrolocal_start +_datarelrolocal_start: + .word __datarelrolocal_start + +.globl _datarellocal_start +_datarellocal_start: + .word __datarellocal_start + +.globl _datarelro_start +_datarelro_start: + .word __datarelro_start + +.globl _got_start +_got_start: + .word __got_start + +.globl _got_end +_got_end: + .word __got_end + +/* + * the actual reset code + */ + +reset: + /* + * set the cpu to SVC32 mode + */ + mrs r0,cpsr + bic r0,r0,#0x1f + orr r0,r0,#0xd3 + msr cpsr,r0 + +#define pWDTCTL 0x80001400 /* Watchdog Timer control register */ +#define pINTENC 0x8000050C /* Interupt-Controller enable clear register */ +#define pCLKSET 0x80000420 /* clock divisor register */ + + /* disable watchdog, set watchdog control register to + * all zeros (default reset) + */ + ldr r0, =pWDTCTL + mov r1, #0x0 + str r1, [r0] + + /* + * mask all IRQs by setting all bits in the INTENC register (default) + */ + mov r1, #0xffffffff + ldr r0, =pINTENC + str r1, [r0] + + /* FCLK:HCLK:PCLK = 1:2:2 */ + /* default FCLK is 200 MHz, using 14.7456 MHz fin */ + ldr r0, =pCLKSET + ldr r1, =0x0004ee39 +@ ldr r1, =0x0005ee39 @ 1: 2: 4 + str r1, [r0] + + /* + * we do sys-critical inits only at reboot, + * not when booting from ram! + */ +#ifndef CONFIG_SKIP_LOWLEVEL_INIT + bl cpu_init_crit +#endif + +/* Set stackpointer in internal RAM to call board_init_f */ +call_board_init_f: + ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) + ldr r0,=0x00000000 + bl board_init_f + +/*------------------------------------------------------------------------------*/ /* + * void relocate_code (addr_sp, gd, addr_moni) + * + * This "function" does not return, instead it continues in RAM + * after relocating the monitor code. + * + */ + .globl relocate_code +relocate_code: + mov r4, r0 /* save addr_sp */ + mov r5, r1 /* save addr of gd */ + mov r6, r2 /* save addr of destination */ + mov r7, r2 /* save addr of destination */ + + /* Set up the stack */ +stack_setup: + mov sp, r4 + + adr r0, _start + ldr r2, _TEXT_BASE + ldr r3, _bss_start + sub r2, r3, r2 /* r2 <- size of armboot */ + add r2, r0, r2 /* r2 <- source end address */ + cmp r0, r6 + beq clear_bss + +#ifndef CONFIG_SKIP_RELOCATE_UBOOT +copy_loop: + ldmia r0!, {r9-r10} /* copy from source address [r0] */ + stmia r6!, {r9-r10} /* copy to target address [r1] */ + cmp r0, r2 /* until source end addreee [r2] */ + ble copy_loop + +#ifndef CONFIG_PRELOADER + /* fix got entries */ + ldr r1, _TEXT_BASE /* Text base */ + mov r0, r7 /* reloc addr */ + ldr r2, _got_start /* addr in Flash */ + ldr r3, _got_end /* addr in Flash */ + sub r3, r3, r1 + add r3, r3, r0 + sub r2, r2, r1 + add r2, r2, r0 + +fixloop: + ldr r4, [r2] + sub r4, r4, r1 + add r4, r4, r0 + str r4, [r2] + add r2, r2, #4 + cmp r2, r3 + bne fixloop +#endif +#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */ + +clear_bss: +#ifndef CONFIG_PRELOADER + ldr r0, _bss_start + ldr r1, _bss_end + ldr r3, _TEXT_BASE /* Text base */ + mov r4, r7 /* reloc addr */ + sub r0, r0, r3 + add r0, r0, r4 + sub r1, r1, r3 + add r1, r1, r4 + mov r2, #0x00000000 /* clear */ + +clbss_l:str r2, [r0] /* clear loop... */ + add r0, r0, #4 + cmp r0, r1 + bne clbss_l +#endif + +/* + * We are done. Do not return, instead branch to second part of board + * initialization, now running from RAM. + */ + ldr r0, _TEXT_BASE + ldr r2, _board_init_r + sub r2, r2, r0 + add r2, r2, r7 /* position from board_init_r in RAM */ + /* setup parameters for board_init_r */ + mov r0, r5 /* gd_t */ + mov r1, r7 /* dest_addr */ + /* jump to it ... */ + mov lr, r2 + mov pc, lr + +_board_init_r: .word board_init_r + +#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ +/* * the actual reset code */ @@ -195,7 +372,7 @@ clbss_l:str r2, [r0] /* clear loop... */ ldr pc, _start_armboot _start_armboot: .word start_armboot - +#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ /* ************************************************************************* @@ -285,9 +462,13 @@ cpu_init_crit: .macro bad_save_user_regs sub sp, sp, #S_FRAME_SIZE stmia sp, {r0 - r12} @ Calling r0-r12 +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) ldr r2, _armboot_start sub r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack +#else + ldr r2, IRQ_STACK_START_IN +#endif ldmia r2, {r2 - r3} @ get pc, cpsr add r0, sp, #S_FRAME_SIZE @ restore sp_SVC @@ -318,9 +499,13 @@ cpu_init_crit: .endm .macro get_bad_stack +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) ldr r13, _armboot_start @ setup our mode stack sub r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack +#else + ldr r13, IRQ_STACK_START_IN @ setup our mode stack +#endif str lr, [r13] @ save caller lr / spsr mrs lr, spsr |