X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fpowerpc%2Fboot%2Fmain.c;h=6f6b50d238b6fa17a19f62552c2560610967927b;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=55ec5986725079c24c56bef079c5f822700b9f0b;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c index 55ec59867..6f6b50d23 100644 --- a/arch/powerpc/boot/main.c +++ b/arch/powerpc/boot/main.c @@ -14,17 +14,12 @@ #include "page.h" #include "string.h" #include "stdio.h" -#include "prom.h" #include "zlib.h" +#include "ops.h" +#include "flatdevtree.h" extern void flush_cache(void *, unsigned long); - -/* Value picked to match that used by yaboot */ -#define PROG_START 0x01400000 /* only used on 64-bit systems */ -#define RAM_END (512<<20) /* Fixme: use OF */ -#define ONE_MB 0x100000 - extern char _start[]; extern char __bss_start[]; extern char _end[]; @@ -32,6 +27,8 @@ extern char _vmlinux_start[]; extern char _vmlinux_end[]; extern char _initrd_start[]; extern char _initrd_end[]; +extern char _dtb_start[]; +extern char _dtb_end[]; struct addr_range { unsigned long addr; @@ -43,21 +40,16 @@ static struct addr_range vmlinuz; static struct addr_range initrd; static unsigned long elfoffset; +static int is_64bit; -static char scratch[46912]; /* scratch space for gunzip, from zlib_inflate_workspacesize() */ +/* scratch space for gunzip; 46912 is from zlib_inflate_workspacesize() */ +static char scratch[46912]; static char elfheader[256]; - -typedef void (*kernel_entry_t)( unsigned long, - unsigned long, - void *, - void *); - +typedef void (*kernel_entry_t)(unsigned long, unsigned long, void *); #undef DEBUG -static unsigned long claim_base; - #define HEAD_CRC 2 #define EXTRA_FIELD 4 #define ORIG_NAME 8 @@ -115,24 +107,6 @@ static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp) zlib_inflateEnd(&s); } -static unsigned long try_claim(unsigned long size) -{ - unsigned long addr = 0; - - for(; claim_base < RAM_END; claim_base += ONE_MB) { -#ifdef DEBUG - printf(" trying: 0x%08lx\n\r", claim_base); -#endif - addr = (unsigned long)claim(claim_base, size, 0); - if ((void *)addr != (void *)-1) - break; - } - if (addr == 0) - return 0; - claim_base = PAGE_ALIGN(claim_base + size); - return addr; -} - static int is_elf64(void *hdr) { Elf64_Ehdr *elf64 = hdr; @@ -152,7 +126,7 @@ static int is_elf64(void *hdr) elf64ph = (Elf64_Phdr *)((unsigned long)elf64 + (unsigned long)elf64->e_phoff); for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++) - if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0) + if (elf64ph->p_type == PT_LOAD) break; if (i >= (unsigned int)elf64->e_phnum) return 0; @@ -161,16 +135,7 @@ static int is_elf64(void *hdr) vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset; vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset; -#if defined(PROG_START) - /* - * Maintain a "magic" minimum address. This keeps some older - * firmware platforms running. - */ - - if (claim_base < PROG_START) - claim_base = PROG_START; -#endif - + is_64bit = 1; return 1; } @@ -193,7 +158,7 @@ static int is_elf32(void *hdr) elf32 = (Elf32_Ehdr *)elfheader; elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff); for (i = 0; i < elf32->e_phnum; i++, elf32ph++) - if (elf32ph->p_type == PT_LOAD && elf32ph->p_offset != 0) + if (elf32ph->p_type == PT_LOAD) break; if (i >= elf32->e_phnum) return 0; @@ -204,30 +169,9 @@ static int is_elf32(void *hdr) return 1; } -void start(unsigned long a1, unsigned long a2, void *promptr, void *sp) +static void prep_kernel(unsigned long a1, unsigned long a2) { int len; - kernel_entry_t kernel_entry; - - memset(__bss_start, 0, _end - __bss_start); - - prom = (int (*)(void *)) promptr; - chosen_handle = finddevice("/chosen"); - if (chosen_handle == (void *) -1) - exit(); - if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4) - exit(); - - printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp); - - /* - * The first available claim_base must be above the end of the - * the loaded kernel wrapper file (_start to _end includes the - * initrd image if it is present) and rounded up to a nice - * 1 MB boundary for good measure. - */ - - claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB); vmlinuz.addr = (unsigned long)_vmlinux_start; vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start); @@ -238,43 +182,58 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp) gunzip(elfheader, sizeof(elfheader), (unsigned char *)vmlinuz.addr, &len); } else - memcpy(elfheader, (const void *)vmlinuz.addr, sizeof(elfheader)); + memcpy(elfheader, (const void *)vmlinuz.addr, + sizeof(elfheader)); if (!is_elf64(elfheader) && !is_elf32(elfheader)) { printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r"); exit(); } + if (platform_ops.image_hdr) + platform_ops.image_hdr(elfheader); - /* We need to claim the memsize plus the file offset since gzip + /* We need to alloc the memsize plus the file offset since gzip * will expand the header (file offset), then the kernel, then * possible rubbish we don't care about. But the kernel bss must * be claimed (it will be zero'd by the kernel itself) */ printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize); - vmlinux.addr = try_claim(vmlinux.memsize); + vmlinux.addr = (unsigned long)malloc(vmlinux.memsize); if (vmlinux.addr == 0) { printf("Can't allocate memory for kernel image !\n\r"); exit(); } /* - * Now we try to claim memory for the initrd (and copy it there) + * Now find the initrd + * + * First see if we have an image attached to us. If so + * allocate memory for it and copy it there. */ initrd.size = (unsigned long)(_initrd_end - _initrd_start); initrd.memsize = initrd.size; - if ( initrd.size > 0 ) { - printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size); - initrd.addr = try_claim(initrd.size); + if (initrd.size > 0) { + printf("Allocating 0x%lx bytes for initrd ...\n\r", + initrd.size); + initrd.addr = (unsigned long)malloc((u32)initrd.size); if (initrd.addr == 0) { - printf("Can't allocate memory for initial ramdisk !\n\r"); + printf("Can't allocate memory for initial " + "ramdisk !\n\r"); exit(); } - a1 = initrd.addr; - a2 = initrd.size; - printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r", - initrd.addr, (unsigned long)_initrd_start, initrd.size); - memmove((void *)initrd.addr, (void *)_initrd_start, initrd.size); - printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd.addr)); + printf("initial ramdisk moving 0x%lx <- 0x%lx " + "(0x%lx bytes)\n\r", initrd.addr, + (unsigned long)_initrd_start, initrd.size); + memmove((void *)initrd.addr, (void *)_initrd_start, + initrd.size); + printf("initrd head: 0x%lx\n\r", + *((unsigned long *)initrd.addr)); + } else if (a2 != 0) { + /* Otherwise, see if yaboot or another loader gave us an initrd */ + initrd.addr = a1; + initrd.memsize = initrd.size = a2; + printf("Using loader supplied initrd at 0x%lx (0x%lx bytes)\n\r", + initrd.addr, initrd.size); } /* Eventually gunzip the kernel */ @@ -286,7 +245,8 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp) (unsigned char *)vmlinuz.addr, &len); printf("done 0x%lx bytes\n\r", len); } else { - memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size); + memmove((void *)vmlinux.addr,(void *)vmlinuz.addr, + vmlinuz.size); } /* Skip over the ELF header */ @@ -297,23 +257,97 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp) vmlinux.addr += elfoffset; flush_cache((void *)vmlinux.addr, vmlinux.size); +} - kernel_entry = (kernel_entry_t)vmlinux.addr; -#ifdef DEBUG - printf( "kernel:\n\r" - " entry addr = 0x%lx\n\r" - " a1 = 0x%lx,\n\r" - " a2 = 0x%lx,\n\r" - " prom = 0x%lx,\n\r" - " bi_recs = 0x%lx,\n\r", - (unsigned long)kernel_entry, a1, a2, - (unsigned long)prom, NULL); -#endif +/* A buffer that may be edited by tools operating on a zImage binary so as to + * edit the command line passed to vmlinux (by setting /chosen/bootargs). + * The buffer is put in it's own section so that tools may locate it easier. + */ +static char builtin_cmdline[COMMAND_LINE_SIZE] + __attribute__((__section__("__builtin_cmdline"))); - kernel_entry(a1, a2, prom, NULL); +static void get_cmdline(char *buf, int size) +{ + void *devp; + int len = strlen(builtin_cmdline); - printf("Error: Linux kernel returned to zImage bootloader!\n\r"); + buf[0] = '\0'; - exit(); + if (len > 0) { /* builtin_cmdline overrides dt's /chosen/bootargs */ + len = min(len, size-1); + strncpy(buf, builtin_cmdline, len); + buf[len] = '\0'; + } + else if ((devp = finddevice("/chosen"))) + getprop(devp, "bootargs", buf, size); } +static void set_cmdline(char *buf) +{ + void *devp; + + if ((devp = finddevice("/chosen"))) + setprop(devp, "bootargs", buf, strlen(buf) + 1); +} + +struct platform_ops platform_ops; +struct dt_ops dt_ops; +struct console_ops console_ops; + +void start(unsigned long a1, unsigned long a2, void *promptr, void *sp) +{ + kernel_entry_t kentry; + char cmdline[COMMAND_LINE_SIZE]; + unsigned long ft_addr = 0; + + memset(__bss_start, 0, _end - __bss_start); + memset(&platform_ops, 0, sizeof(platform_ops)); + memset(&dt_ops, 0, sizeof(dt_ops)); + memset(&console_ops, 0, sizeof(console_ops)); + + if (platform_init(promptr, _dtb_start, _dtb_end)) + exit(); + if (console_ops.open && (console_ops.open() < 0)) + exit(); + if (platform_ops.fixups) + platform_ops.fixups(); + + printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", + _start, sp); + + prep_kernel(a1, a2); + + /* If cmdline came from zimage wrapper or if we can edit the one + * in the dt, print it out and edit it, if possible. + */ + if ((strlen(builtin_cmdline) > 0) || console_ops.edit_cmdline) { + get_cmdline(cmdline, COMMAND_LINE_SIZE); + printf("\n\rLinux/PowerPC load: %s", cmdline); + if (console_ops.edit_cmdline) + console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE); + printf("\n\r"); + set_cmdline(cmdline); + } + + printf("Finalizing device tree..."); + if (dt_ops.finalize) + ft_addr = dt_ops.finalize(); + if (ft_addr) + printf(" flat tree at 0x%lx\n\r", ft_addr); + else + printf(" using OF tree (promptr=%p)\n\r", promptr); + + if (console_ops.close) + console_ops.close(); + + kentry = (kernel_entry_t) vmlinux.addr; + if (ft_addr) + kentry(ft_addr, 0, NULL); + else + /* XXX initrd addr/size should be passed in properties */ + kentry(initrd.addr, initrd.size, promptr); + + /* console closed so printf below may not work */ + printf("Error: Linux kernel returned to zImage boot wrapper!\n\r"); + exit(); +}