Change the implementation for arm1176 to relocate the code to an arbitrary address in RAM.
Signed-off-by: Heiko Schocher hs@denx.de --- arch/arm/cpu/arm1176/start.S | 286 +++++++++++++++++++++++++++++++++++++++ arch/arm/cpu/arm1176/u-boot.lds | 14 ++- 2 files changed, 299 insertions(+), 1 deletions(-)
diff --git a/arch/arm/cpu/arm1176/start.S b/arch/arm/cpu/arm1176/start.S index f98a7aa..e5e7913 100644 --- a/arch/arm/cpu/arm1176/start.S +++ b/arch/arm/cpu/arm1176/start.S @@ -95,6 +95,7 @@ _end_vect: ************************************************************************* */
+.globl _TEXT_BASE _TEXT_BASE: .word TEXT_BASE
@@ -106,9 +107,11 @@ _TEXT_BASE: _TEXT_PHY_BASE: .word CONFIG_SYS_PHY_UBOOT_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. @@ -121,6 +124,275 @@ _bss_start: _bss_end: .word _end
+#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, #0x3f + orr r0, r0, #0xd3 + msr cpsr, r0 + +/* + ************************************************************************* + * + * CPU_init_critical registers + * + * setup important registers + * setup memory timing + * + ************************************************************************* + */ + /* + * we do sys-critical inits only at reboot, + * not when booting from ram! + */ +cpu_init_crit: + /* + * When booting from NAND - it has definitely been a reset, so, no need + * to flush caches and disable the MMU + */ +#ifndef CONFIG_NAND_SPL + /* + * flush v4 I/D caches + */ + mov r0, #0 + mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */ + mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ + + /* + * disable MMU stuff and caches + */ + mrc p15, 0, r0, c1, c0, 0 + bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS) + bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM) + orr r0, r0, #0x00000002 @ set bit 2 (A) Align + orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache + + /* Prepare to disable the MMU */ + adr r2, mmu_disable_phys + sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - TEXT_BASE) + b mmu_disable + + .align 5 + /* Run in a single cache-line */ +mmu_disable: + mcr p15, 0, r0, c1, c0, 0 + nop + nop + mov pc, r2 +mmu_disable_phys: + +#ifdef CONFIG_DISABLE_TCM + /* + * Disable the TCMs + */ + mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */ + cmp r0, #0 + beq skip_tcmdisable + mov r1, #0 + mov r2, #1 + tst r0, r2 + mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/ + tst r0, r2, LSL #16 + mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/ +skip_tcmdisable: +#endif +#endif + +#ifdef CONFIG_PERIPORT_REMAP + /* Peri port setup */ + ldr r0, =CONFIG_PERIPORT_BASE + orr r0, r0, #CONFIG_PERIPORT_SIZE + mcr p15,0,r0,c15,c2,4 +#endif + + /* + * Go setup Memory and board specific bits prior to relocation. + */ + bl lowlevel_init /* go setup pll,mux,memory */ + +/* 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 */ + +#ifdef CONFIG_ENABLE_MMU +enable_mmu: + /* enable domain access */ + ldr r5, =0x0000ffff + mcr p15, 0, r5, c3, c0, 0 /* load domain access register */ + + /* Set the TTB register */ + ldr r0, _mmu_table_base + ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE + ldr r2, =0xfff00000 + bic r0, r0, r2 + orr r1, r0, r1 + mcr p15, 0, r1, c2, c0, 0 + + /* Enable the MMU */ + mrc p15, 0, r0, c1, c0, 0 + orr r0, r0, #1 /* Set CR_M to enable MMU */ + + /* Prepare to enable the MMU */ + adr r1, skip_hw_init + and r1, r1, #0x3fc + ldr r2, _TEXT_BASE + ldr r3, =0xfff00000 + and r2, r2, r3 + orr r2, r2, r1 + b mmu_enable + + .align 5 + /* Run in a single cache-line */ +mmu_enable: + + mcr p15, 0, r0, c1, c0, 0 + nop + nop + mov pc, r2 +skip_hw_init: +#endif + +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 + + bl coloured_LED_init + bl red_LED_on +#endif + +/* + * We are done. Do not return, instead branch to second part of board + * initialization, now running from RAM. + */ +#ifdef CONFIG_NAND_SPL + ldr pc, _nand_boot + +_nand_boot: .word nand_boot +#else + 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 +#endif + +#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ + /* * the actual reset code */ @@ -299,6 +571,8 @@ _start_armboot: /* .word nand_boot*/ #endif
+#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ + #ifdef CONFIG_ENABLE_MMU _mmu_table_base: .word mmu_table @@ -385,10 +659,14 @@ phy_last_jump: /* Save user registers (now in svc mode) r0-r12 */ stmia sp, {r0 - r12}
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) ldr r2, _armboot_start sub r2, r2, #(CONFIG_SYS_MALLOC_LEN) /* set base 2 words into abort stack */ sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) +#else + ldr r2, IRQ_STACK_START_IN +#endif /* get values for "aborted" pc and cpsr (into parm regs) */ ldmia r2, {r2 - r3} /* grab pointer to old stack */ @@ -403,12 +681,16 @@ phy_last_jump: .endm
.macro get_bad_stack +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) /* setup our mode stack (enter in banked mode) */ ldr r13, _armboot_start /* move past malloc pool */ sub r13, r13, #(CONFIG_SYS_MALLOC_LEN) /* move to reserved a couple spots for abort stack */ sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE + 8) +#else + ldr r13, IRQ_STACK_START_IN @ setup our mode stack +#endif
/* save caller lr in position 0 of saved stack */ str lr, [r13] @@ -433,12 +715,16 @@ phy_last_jump: sub r13, r13, #4 /* save R0's value. */ str r0, [r13] +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) /* get data regions start */ ldr r0, _armboot_start /* move past malloc pool */ sub r0, r0, #(CONFIG_SYS_MALLOC_LEN) /* move past gbl and a couple spots for abort stack */ sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE + 8) +#else + ldr r13, IRQ_STACK_START_IN @ setup our mode stack +#endif /* save caller lr in position 0 of saved stack */ str lr, [r0] /* get the spsr */ diff --git a/arch/arm/cpu/arm1176/u-boot.lds b/arch/arm/cpu/arm1176/u-boot.lds index 8969587..fa640ee 100644 --- a/arch/arm/cpu/arm1176/u-boot.lds +++ b/arch/arm/cpu/arm1176/u-boot.lds @@ -39,11 +39,23 @@ SECTIONS .rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
. = ALIGN(4); - .data : { *(.data) } + .data : { + *(.data) + __datarel_start = .; + *(.data.rel) + __datarelrolocal_start = .; + *(.data.rel.ro.local) + __datarellocal_start = .; + *(.data.rel.local) + __datarelro_start = .; + *(.data.rel.ro) + }
+ __got_start = .; . = ALIGN(4); .got : { *(.got) }
+ __got_end = .; . = .; __u_boot_cmd_start = .; .u_boot_cmd : { *(.u_boot_cmd) }