From 561142af20f1fd7b425d9425730014e656defb91 Mon Sep 17 00:00:00 2001 From: Heiko Schocher Date: Fri, 17 Sep 2010 13:10:41 +0200 Subject: [PATCH] ARM: implement relocation for ARM V7 (OMAP) Change the implementation for ARM V7 to relocate the code to an arbitrary address in RAM. Adapt the Beagle board (Cortex A8) to test the changes. Portions of this work were supported by funding from the CE Linux Forum. Signed-off-by: Heiko Schocher --- arch/arm/cpu/armv7/mx51/u-boot.lds | 14 ++- arch/arm/cpu/armv7/omap3/emif4.c | 34 +++++ arch/arm/cpu/armv7/omap3/sdrc.c | 38 ++++++ arch/arm/cpu/armv7/start.S | 191 ++++++++++++++++++++++++++++- arch/arm/cpu/armv7/u-boot.lds | 14 ++- board/ti/beagle/config.mk | 2 +- include/configs/omap3_beagle.h | 5 + 7 files changed, 291 insertions(+), 7 deletions(-) diff --git a/arch/arm/cpu/armv7/mx51/u-boot.lds b/arch/arm/cpu/armv7/mx51/u-boot.lds index d66434c95d..55d6599b41 100644 --- a/arch/arm/cpu/armv7/mx51/u-boot.lds +++ b/arch/arm/cpu/armv7/mx51/u-boot.lds @@ -44,10 +44,22 @@ SECTIONS .rodata : { *(.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 = .; diff --git a/arch/arm/cpu/armv7/omap3/emif4.c b/arch/arm/cpu/armv7/omap3/emif4.c index fae5b1161b..da2cd90013 100644 --- a/arch/arm/cpu/armv7/omap3/emif4.c +++ b/arch/arm/cpu/armv7/omap3/emif4.c @@ -136,6 +136,7 @@ void do_emif4_init(void) * dram_init - * - Sets uboots idea of sdram size */ +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) int dram_init(void) { DECLARE_GLOBAL_DATA_PTR; @@ -157,6 +158,39 @@ int dram_init(void) return 0; } +#else +int dram_init(void) +{ + DECLARE_GLOBAL_DATA_PTR; + unsigned int size0 = 0, size1 = 0; + + size0 = get_sdr_cs_size(CS0); + /* + * If a second bank of DDR is attached to CS1 this is + * where it can be started. Early init code will init + * memory on CS0. + */ + if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED)) + size1 = get_sdr_cs_size(CS1); + + gd->ram_size = size0 + size1; + return 0; +} + +void dram_init_banksize (void) +{ + DECLARE_GLOBAL_DATA_PTR; + unsigned int size0 = 0, size1 = 0; + + size0 = get_sdr_cs_size(CS0); + size1 = get_sdr_cs_size(CS1); + + gd->bd->bi_dram[0].start = PHYS_SDRAM_1; + gd->bd->bi_dram[0].size = size0; + gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1); + gd->bd->bi_dram[1].size = size1; +} +#endif /* * mem_init() - diff --git a/arch/arm/cpu/armv7/omap3/sdrc.c b/arch/arm/cpu/armv7/omap3/sdrc.c index 8905224439..2719bb53a7 100644 --- a/arch/arm/cpu/armv7/omap3/sdrc.c +++ b/arch/arm/cpu/armv7/omap3/sdrc.c @@ -163,6 +163,7 @@ void do_sdrc_init(u32 cs, u32 early) * dram_init - * - Sets uboots idea of sdram size */ +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) int dram_init(void) { DECLARE_GLOBAL_DATA_PTR; @@ -188,6 +189,43 @@ int dram_init(void) return 0; } +#else +int dram_init(void) +{ + DECLARE_GLOBAL_DATA_PTR; + unsigned int size0 = 0, size1 = 0; + + size0 = get_sdr_cs_size(CS0); + /* + * If a second bank of DDR is attached to CS1 this is + * where it can be started. Early init code will init + * memory on CS0. + */ + if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED)) { + do_sdrc_init(CS1, NOT_EARLY); + make_cs1_contiguous(); + + size1 = get_sdr_cs_size(CS1); + } + gd->ram_size = size0 + size1; + + return 0; +} + +void dram_init_banksize (void) +{ + DECLARE_GLOBAL_DATA_PTR; + unsigned int size0 = 0, size1 = 0; + + size0 = get_sdr_cs_size(CS0); + size1 = get_sdr_cs_size(CS1); + + gd->bd->bi_dram[0].start = PHYS_SDRAM_1; + gd->bd->bi_dram[0].size = size0; + gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1); + gd->bd->bi_dram[1].size = size1; +} +#endif /* * mem_init - diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 1e0a1504bf..f411c0f4f0 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -65,12 +65,15 @@ _end_vect: * *************************************************************************/ +.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. @@ -95,6 +98,176 @@ 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 + +#if (CONFIG_OMAP34XX) + /* Copy vectors to mask ROM indirect addr */ + adr r0, _start @ r0 <- current position of code + add r0, r0, #4 @ skip reset vector + 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 */ +#if !defined(CONFIG_SYS_NAND_BOOT) && !defined(CONFIG_SYS_ONENAND_BOOT) + /* No need to copy/exec the clock code - DPLL adjust already done + * in NAND/oneNAND Boot. + */ + bl cpy_clk_code @ put dpll adjust code behind vectors +#endif /* NAND Boot */ +#endif + /* the mask ROM code should have PLL and others stable */ +#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 + +#ifndef CONFIG_SKIP_RELOCATE_UBOOT + 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 +#ifndef CONFIG_PRELOADER + beq jump_2_ram +#endif + +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 + 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 + +clear_bss: + 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 /* #ifndef CONFIG_PRELOADER */ +#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */ + +/* + * We are done. Do not return, instead branch to second part of board + * initialization, now running from RAM. + */ +jump_2_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 */ @@ -180,7 +353,7 @@ clbss_l: ldr pc, _start_armboot @ jump to C code _start_armboot: .word start_armboot - +#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ /************************************************************************* * @@ -263,11 +436,14 @@ cpu_init_crit: @ user stack stmia sp, {r0 - r12} @ Save user registers (now in @ svc mode) r0-r12 - +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) ldr r2, _armboot_start sub r2, r2, #(CONFIG_SYS_MALLOC_LEN) sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE + 8) @ set base 2 words into abort +#else + ldr r2, IRQ_STACK_START_IN @ set base 2 words into abort @ stack +#endif 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 @@ -303,11 +479,14 @@ cpu_init_crit: .endm .macro get_bad_stack +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) ldr r13, _armboot_start @ setup our mode stack (enter - @ in banked mode) sub r13, r13, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE + 8) @ move to reserved a couple - @ spots for abort stack +#else + ldr r13, IRQ_STACK_START_IN @ setup our mode stack (enter + @ in banked mode) +#endif str lr, [r13] @ save caller lr in position 0 @ of saved stack @@ -328,10 +507,14 @@ cpu_init_crit: sub r13, r13, #4 @ space on current stack for @ scratch reg. str r0, [r13] @ save R0's value. +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) ldr r0, _armboot_start @ get data regions start sub r0, r0, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE + 8) @ move past gbl and a couple +#else + ldr r0, IRQ_STACK_START_IN @ get data regions start @ spots for abort stack +#endif str lr, [r0] @ save caller lr in position 0 @ of saved stack mrs r0, spsr @ get the spsr diff --git a/arch/arm/cpu/armv7/u-boot.lds b/arch/arm/cpu/armv7/u-boot.lds index 9e5b5a97d7..d4fd3fccee 100644 --- a/arch/arm/cpu/armv7/u-boot.lds +++ b/arch/arm/cpu/armv7/u-boot.lds @@ -42,10 +42,22 @@ 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) } diff --git a/board/ti/beagle/config.mk b/board/ti/beagle/config.mk index 879b2e236f..6fb10e31e3 100644 --- a/board/ti/beagle/config.mk +++ b/board/ti/beagle/config.mk @@ -30,4 +30,4 @@ # (mem base + reserved) # For use with external or internal boots. -TEXT_BASE = 0x80e80000 +TEXT_BASE = 0x80008000 diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h index 3f6e803eb9..2463be416e 100644 --- a/include/configs/omap3_beagle.h +++ b/include/configs/omap3_beagle.h @@ -340,4 +340,9 @@ extern unsigned int boot_flash_sec; extern unsigned int boot_flash_type; #endif +/* additions for new relocation code, must added to all boards */ +#undef CONFIG_SYS_ARM_WITHOUT_RELOC /* This board is tested with relocation support */ +#define CONFIG_SYS_SDRAM_BASE PHYS_SDRAM_1 +#define CONFIG_SYS_INIT_SP_ADDR (LOW_LEVEL_SRAM_STACK - CONFIG_SYS_GBL_DATA_SIZE) + #endif /* __CONFIG_H */ -- 2.39.5