diff options
Diffstat (limited to 'hw/arm_boot.c')
| -rw-r--r-- | hw/arm_boot.c | 69 |
1 files changed, 45 insertions, 24 deletions
diff --git a/hw/arm_boot.c b/hw/arm_boot.c index a6e9143..ec3b8d5 100644 --- a/hw/arm_boot.c +++ b/hw/arm_boot.c @@ -18,7 +18,6 @@ #define KERNEL_ARGS_ADDR 0x100 #define KERNEL_LOAD_ADDR 0x00010000 -#define INITRD_LOAD_ADDR 0x00d00000 /* The worlds second smallest bootloader. Set r0-r2, then jump to kernel. */ static uint32_t bootloader[] = { @@ -45,11 +44,17 @@ static uint32_t bootloader[] = { * for an interprocessor interrupt and polling a configurable * location for the kernel secondary CPU entry point. */ +#define DSB_INSN 0xf57ff04f +#define CP15_DSB_INSN 0xee070f9a /* mcr cp15, 0, r0, c7, c10, 4 */ + static uint32_t smpboot[] = { - 0xe59f201c, /* ldr r2, gic_cpu_if */ - 0xe59f001c, /* ldr r0, startaddr */ + 0xe59f2028, /* ldr r2, gic_cpu_if */ + 0xe59f0028, /* ldr r0, startaddr */ 0xe3a01001, /* mov r1, #1 */ - 0xe5821000, /* str r1, [r2] */ + 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 */ @@ -66,6 +71,11 @@ static void default_write_secondary(ARMCPU *cpu, 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]); } rom_add_blob_fixed("smpboot", smpboot, sizeof(smpboot), @@ -89,8 +99,8 @@ static void default_reset_secondary(ARMCPU *cpu, static void set_kernel_args(const struct arm_boot_info *info) { int initrd_size = info->initrd_size; - target_phys_addr_t base = info->loader_start; - target_phys_addr_t p; + hwaddr base = info->loader_start; + hwaddr p; p = base + KERNEL_ARGS_ADDR; /* ATAG_CORE */ @@ -109,7 +119,7 @@ static void set_kernel_args(const struct arm_boot_info *info) /* ATAG_INITRD2 */ WRITE_WORD(p, 4); WRITE_WORD(p, 0x54420005); - WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR); + WRITE_WORD(p, info->initrd_start); WRITE_WORD(p, initrd_size); } if (info->kernel_cmdline && *info->kernel_cmdline) { @@ -142,10 +152,10 @@ static void set_kernel_args(const struct arm_boot_info *info) static void set_kernel_args_old(const struct arm_boot_info *info) { - target_phys_addr_t p; + hwaddr p; const char *s; int initrd_size = info->initrd_size; - target_phys_addr_t base = info->loader_start; + hwaddr base = info->loader_start; /* see linux/include/asm-arm/setup.h */ p = base + KERNEL_ARGS_ADDR; @@ -185,10 +195,11 @@ static void set_kernel_args_old(const struct arm_boot_info *info) /* pages_in_vram */ WRITE_WORD(p, 0); /* initrd_start */ - if (initrd_size) - WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR); - else + if (initrd_size) { + WRITE_WORD(p, info->initrd_start); + } else { WRITE_WORD(p, 0); + } /* initrd_size */ WRITE_WORD(p, initrd_size); /* rd_start */ @@ -213,7 +224,7 @@ static void set_kernel_args_old(const struct arm_boot_info *info) } } -static int load_dtb(target_phys_addr_t addr, const struct arm_boot_info *binfo) +static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo) { #ifdef CONFIG_FDT uint32_t *mem_reg_property; @@ -281,14 +292,13 @@ static int load_dtb(target_phys_addr_t addr, const struct arm_boot_info *binfo) if (binfo->initrd_size) { rc = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-start", - binfo->loader_start + INITRD_LOAD_ADDR); + binfo->initrd_start); if (rc < 0) { fprintf(stderr, "couldn't set /chosen/linux,initrd-start\n"); } rc = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-end", - binfo->loader_start + INITRD_LOAD_ADDR + - binfo->initrd_size); + binfo->initrd_start + binfo->initrd_size); if (rc < 0) { fprintf(stderr, "couldn't set /chosen/linux,initrd-end\n"); } @@ -342,7 +352,7 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) int n; int is_linux = 0; uint64_t elf_entry; - target_phys_addr_t entry; + hwaddr entry; int big_endian; QemuOpts *machine_opts; @@ -375,6 +385,19 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) big_endian = 0; #endif + /* We want to put the initrd far enough into RAM that when the + * kernel is uncompressed it will not clobber the initrd. However + * on boards without much RAM we must ensure that we still leave + * enough room for a decent sized initrd, and on boards with large + * amounts of RAM we must avoid the initrd being so far up in RAM + * that it is outside lowmem and inaccessible to the kernel. + * So for boards with less than 256MB of RAM we put the initrd + * halfway into RAM, and for boards with 256MB of RAM or more we put + * the initrd at 128MB. + */ + info->initrd_start = info->loader_start + + MIN(info->ram_size / 2, 128 * 1024 * 1024); + /* Assume that raw images are linux kernels, and ELF images are not. */ kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry, NULL, NULL, big_endian, ELF_MACHINE, 1); @@ -398,10 +421,9 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) if (is_linux) { if (info->initrd_filename) { initrd_size = load_image_targphys(info->initrd_filename, - info->loader_start - + INITRD_LOAD_ADDR, - info->ram_size - - INITRD_LOAD_ADDR); + info->initrd_start, + info->ram_size - + info->initrd_start); if (initrd_size < 0) { fprintf(stderr, "qemu: could not load initrd '%s'\n", info->initrd_filename); @@ -419,9 +441,8 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) */ if (info->dtb_filename) { /* Place the DTB after the initrd in memory */ - target_phys_addr_t dtb_start = TARGET_PAGE_ALIGN(info->loader_start - + INITRD_LOAD_ADDR - + initrd_size); + hwaddr dtb_start = TARGET_PAGE_ALIGN(info->initrd_start + + initrd_size); if (load_dtb(dtb_start, info)) { exit(1); } |