diff options
Diffstat (limited to 'hw/arm/boot.c')
| -rw-r--r-- | hw/arm/boot.c | 152 |
1 files changed, 107 insertions, 45 deletions
diff --git a/hw/arm/boot.c b/hw/arm/boot.c index 55d552f3a8..0c05a64c8c 100644 --- a/hw/arm/boot.c +++ b/hw/arm/boot.c @@ -20,15 +20,33 @@ #define KERNEL_ARGS_ADDR 0x100 #define KERNEL_LOAD_ADDR 0x00010000 +typedef enum { + FIXUP_NONE = 0, /* do nothing */ + FIXUP_TERMINATOR, /* end of insns */ + FIXUP_BOARDID, /* overwrite with board ID number */ + FIXUP_ARGPTR, /* overwrite with pointer to kernel args */ + FIXUP_ENTRYPOINT, /* overwrite with kernel entry point */ + FIXUP_GIC_CPU_IF, /* overwrite with GIC CPU interface address */ + FIXUP_BOOTREG, /* overwrite with boot register address */ + FIXUP_DSB, /* overwrite with correct DSB insn for cpu */ + FIXUP_MAX, +} FixupType; + +typedef struct ARMInsnFixup { + uint32_t insn; + FixupType fixup; +} ARMInsnFixup; + /* The worlds second smallest bootloader. Set r0-r2, then jump to kernel. */ -static uint32_t bootloader[] = { - 0xe3a00000, /* mov r0, #0 */ - 0xe59f1004, /* ldr r1, [pc, #4] */ - 0xe59f2004, /* ldr r2, [pc, #4] */ - 0xe59ff004, /* ldr pc, [pc, #4] */ - 0, /* Board ID */ - 0, /* Address of kernel args. Set by integratorcp_init. */ - 0 /* Kernel entry point. Set by integratorcp_init. */ +static const ARMInsnFixup bootloader[] = { + { 0xe3a00000 }, /* mov r0, #0 */ + { 0xe59f1004 }, /* ldr r1, [pc, #4] */ + { 0xe59f2004 }, /* ldr r2, [pc, #4] */ + { 0xe59ff004 }, /* ldr pc, [pc, #4] */ + { 0, FIXUP_BOARDID }, + { 0, FIXUP_ARGPTR }, + { 0, FIXUP_ENTRYPOINT }, + { 0, FIXUP_TERMINATOR } }; /* Handling for secondary CPU boot in a multicore system. @@ -48,39 +66,83 @@ static uint32_t bootloader[] = { #define DSB_INSN 0xf57ff04f #define CP15_DSB_INSN 0xee070f9a /* mcr cp15, 0, r0, c7, c10, 4 */ -static uint32_t smpboot[] = { - 0xe59f2028, /* ldr r2, gic_cpu_if */ - 0xe59f0028, /* ldr r0, startaddr */ - 0xe3a01001, /* mov r1, #1 */ - 0xe5821000, /* str r1, [r2] - set GICC_CTLR.Enable */ - 0xe3a010ff, /* mov r1, #0xff */ - 0xe5821004, /* str r1, [r2, 4] - set GIC_PMR.Priority to 0xff */ - DSB_INSN, /* dsb */ - 0xe320f003, /* wfi */ - 0xe5901000, /* ldr r1, [r0] */ - 0xe1110001, /* tst r1, r1 */ - 0x0afffffb, /* beq <wfi> */ - 0xe12fff11, /* bx r1 */ - 0, /* gic_cpu_if: base address of GIC CPU interface */ - 0 /* bootreg: Boot register address is held here */ +static const ARMInsnFixup smpboot[] = { + { 0xe59f2028 }, /* ldr r2, gic_cpu_if */ + { 0xe59f0028 }, /* ldr r0, bootreg_addr */ + { 0xe3a01001 }, /* mov r1, #1 */ + { 0xe5821000 }, /* str r1, [r2] - set GICC_CTLR.Enable */ + { 0xe3a010ff }, /* mov r1, #0xff */ + { 0xe5821004 }, /* str r1, [r2, 4] - set GIC_PMR.Priority to 0xff */ + { 0, FIXUP_DSB }, /* dsb */ + { 0xe320f003 }, /* wfi */ + { 0xe5901000 }, /* ldr r1, [r0] */ + { 0xe1110001 }, /* tst r1, r1 */ + { 0x0afffffb }, /* beq <wfi> */ + { 0xe12fff11 }, /* bx r1 */ + { 0, FIXUP_GIC_CPU_IF }, /* gic_cpu_if: .word 0x.... */ + { 0, FIXUP_BOOTREG }, /* bootreg_addr: .word 0x.... */ + { 0, FIXUP_TERMINATOR } }; +static void write_bootloader(const char *name, hwaddr addr, + const ARMInsnFixup *insns, uint32_t *fixupcontext) +{ + /* Fix up the specified bootloader fragment and write it into + * guest memory using rom_add_blob_fixed(). fixupcontext is + * an array giving the values to write in for the fixup types + * which write a value into the code array. + */ + int i, len; + uint32_t *code; + + len = 0; + while (insns[len].fixup != FIXUP_TERMINATOR) { + len++; + } + + code = g_new0(uint32_t, len); + + for (i = 0; i < len; i++) { + uint32_t insn = insns[i].insn; + FixupType fixup = insns[i].fixup; + + switch (fixup) { + case FIXUP_NONE: + break; + case FIXUP_BOARDID: + case FIXUP_ARGPTR: + case FIXUP_ENTRYPOINT: + case FIXUP_GIC_CPU_IF: + case FIXUP_BOOTREG: + case FIXUP_DSB: + insn = fixupcontext[fixup]; + break; + default: + abort(); + } + code[i] = tswap32(insn); + } + + rom_add_blob_fixed(name, code, len * sizeof(uint32_t), addr); + + g_free(code); +} + static void default_write_secondary(ARMCPU *cpu, const struct arm_boot_info *info) { - int n; - smpboot[ARRAY_SIZE(smpboot) - 1] = info->smp_bootreg_addr; - smpboot[ARRAY_SIZE(smpboot) - 2] = info->gic_cpu_if_addr; - for (n = 0; n < ARRAY_SIZE(smpboot); n++) { - /* Replace DSB with the pre-v7 DSB if necessary. */ - if (!arm_feature(&cpu->env, ARM_FEATURE_V7) && - smpboot[n] == DSB_INSN) { - smpboot[n] = CP15_DSB_INSN; - } - smpboot[n] = tswap32(smpboot[n]); + uint32_t fixupcontext[FIXUP_MAX]; + + fixupcontext[FIXUP_GIC_CPU_IF] = info->gic_cpu_if_addr; + fixupcontext[FIXUP_BOOTREG] = info->smp_bootreg_addr; + if (arm_feature(&cpu->env, ARM_FEATURE_V7)) { + fixupcontext[FIXUP_DSB] = DSB_INSN; + } else { + fixupcontext[FIXUP_DSB] = CP15_DSB_INSN; } - rom_add_blob_fixed("smpboot", smpboot, sizeof(smpboot), - info->smp_loader_start); + + write_bootloader("smpboot", info->smp_loader_start, + smpboot, fixupcontext); } static void default_reset_secondary(ARMCPU *cpu, @@ -354,7 +416,6 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) CPUState *cs = CPU(cpu); int kernel_size; int initrd_size; - int n; int is_linux = 0; uint64_t elf_entry; hwaddr entry; @@ -420,6 +481,8 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) } info->entry = entry; if (is_linux) { + uint32_t fixupcontext[FIXUP_MAX]; + if (info->initrd_filename) { initrd_size = load_ramdisk(info->initrd_filename, info->initrd_start, @@ -441,7 +504,7 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) } info->initrd_size = initrd_size; - bootloader[4] = info->board_id; + fixupcontext[FIXUP_BOARDID] = info->board_id; /* for device tree boot, we pass the DTB directly in r2. Otherwise * we point to the kernel args. @@ -456,9 +519,9 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) if (load_dtb(dtb_start, info)) { exit(1); } - bootloader[5] = dtb_start; + fixupcontext[FIXUP_ARGPTR] = dtb_start; } else { - bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR; + fixupcontext[FIXUP_ARGPTR] = info->loader_start + KERNEL_ARGS_ADDR; if (info->ram_size >= (1ULL << 32)) { fprintf(stderr, "qemu: RAM size must be less than 4GB to boot" " Linux kernel using ATAGS (try passing a device tree" @@ -466,12 +529,11 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) exit(1); } } - bootloader[6] = entry; - for (n = 0; n < sizeof(bootloader) / 4; n++) { - bootloader[n] = tswap32(bootloader[n]); - } - rom_add_blob_fixed("bootloader", bootloader, sizeof(bootloader), - info->loader_start); + fixupcontext[FIXUP_ENTRYPOINT] = entry; + + write_bootloader("bootloader", info->loader_start, + bootloader, fixupcontext); + if (info->nb_cpus > 1) { info->write_secondary_boot(cpu, info); } |