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-rw-r--r--arch/ppc64/boot/main.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/arch/ppc64/boot/main.c b/arch/ppc64/boot/main.c
new file mode 100644
index 000000000000..b0fa86ad8b1b
--- /dev/null
+++ b/arch/ppc64/boot/main.c
@@ -0,0 +1,331 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include "ppc32-types.h"
+#include "zlib.h"
+#include <linux/elf.h>
+#include <linux/string.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/bootinfo.h>
+
+extern void *finddevice(const char *);
+extern int getprop(void *, const char *, void *, int);
+extern void printk(char *fmt, ...);
+extern void printf(const char *fmt, ...);
+extern int sprintf(char *buf, const char *fmt, ...);
+void gunzip(void *, int, unsigned char *, int *);
+void *claim(unsigned int, unsigned int, unsigned int);
+void flush_cache(void *, unsigned long);
+void pause(void);
+extern void exit(void);
+
+unsigned long strlen(const char *s);
+void *memmove(void *dest, const void *src, unsigned long n);
+void *memcpy(void *dest, const void *src, unsigned long n);
+
+/* Value picked to match that used by yaboot */
+#define PROG_START 0x01400000
+#define RAM_END (256<<20) // Fixme: use OF */
+
+char *avail_ram;
+char *begin_avail, *end_avail;
+char *avail_high;
+unsigned int heap_use;
+unsigned int heap_max;
+
+extern char _start[];
+extern char _vmlinux_start[];
+extern char _vmlinux_end[];
+extern char _initrd_start[];
+extern char _initrd_end[];
+extern unsigned long vmlinux_filesize;
+extern unsigned long vmlinux_memsize;
+
+struct addr_range {
+ unsigned long addr;
+ unsigned long size;
+ unsigned long memsize;
+};
+struct addr_range vmlinux = {0, 0, 0};
+struct addr_range vmlinuz = {0, 0, 0};
+struct addr_range initrd = {0, 0, 0};
+
+static char scratch[128<<10]; /* 128kB of scratch space for gunzip */
+
+typedef void (*kernel_entry_t)( unsigned long,
+ unsigned long,
+ void *,
+ void *);
+
+
+int (*prom)(void *);
+
+void *chosen_handle;
+void *stdin;
+void *stdout;
+void *stderr;
+
+#undef DEBUG
+
+static unsigned long claim_base = PROG_START;
+
+static unsigned long try_claim(unsigned long size)
+{
+ unsigned long addr = 0;
+
+ for(; claim_base < RAM_END; claim_base += 0x100000) {
+#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;
+}
+
+void start(unsigned long a1, unsigned long a2, void *promptr)
+{
+ unsigned long i;
+ kernel_entry_t kernel_entry;
+ Elf64_Ehdr *elf64;
+ Elf64_Phdr *elf64ph;
+
+ prom = (int (*)(void *)) promptr;
+ chosen_handle = finddevice("/chosen");
+ if (chosen_handle == (void *) -1)
+ exit();
+ if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
+ exit();
+ stderr = stdout;
+ if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
+ exit();
+
+ printf("\n\rzImage starting: loaded at 0x%x\n\r", (unsigned)_start);
+
+ /*
+ * Now we try to claim some memory for the kernel itself
+ * our "vmlinux_memsize" is the memory footprint in RAM, _HOWEVER_, what
+ * our Makefile stuffs in is an image containing all sort of junk including
+ * an ELF header. We need to do some calculations here to find the right
+ * size... In practice we add 1Mb, that is enough, but we should really
+ * consider fixing the Makefile to put a _raw_ kernel in there !
+ */
+ vmlinux_memsize += 0x100000;
+ printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux_memsize);
+ vmlinux.addr = try_claim(vmlinux_memsize);
+ if (vmlinux.addr == 0) {
+ printf("Can't allocate memory for kernel image !\n\r");
+ exit();
+ }
+ vmlinuz.addr = (unsigned long)_vmlinux_start;
+ vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
+ vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
+ vmlinux.memsize = vmlinux_memsize;
+
+ /*
+ * Now we try to claim memory for the initrd (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.addr == 0) {
+ 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 (%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", *((u32 *)initrd.addr));
+ }
+
+ /* Eventually gunzip the kernel */
+ if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
+ int len;
+ avail_ram = scratch;
+ begin_avail = avail_high = avail_ram;
+ end_avail = scratch + sizeof(scratch);
+ printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
+ vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
+ len = vmlinuz.size;
+ gunzip((void *)vmlinux.addr, vmlinux.size,
+ (unsigned char *)vmlinuz.addr, &len);
+ printf("done 0x%lx bytes\n\r", len);
+ printf("0x%x bytes of heap consumed, max in use 0x%x\n\r",
+ (unsigned)(avail_high - begin_avail), heap_max);
+ } else {
+ memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
+ }
+
+ /* Skip over the ELF header */
+ elf64 = (Elf64_Ehdr *)vmlinux.addr;
+ if ( elf64->e_ident[EI_MAG0] != ELFMAG0 ||
+ elf64->e_ident[EI_MAG1] != ELFMAG1 ||
+ elf64->e_ident[EI_MAG2] != ELFMAG2 ||
+ elf64->e_ident[EI_MAG3] != ELFMAG3 ||
+ elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
+ elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
+ elf64->e_type != ET_EXEC ||
+ elf64->e_machine != EM_PPC64 )
+ {
+ printf("Error: not a valid PPC64 ELF file!\n\r");
+ exit();
+ }
+
+ 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)
+ break;
+ }
+#ifdef DEBUG
+ printf("... skipping 0x%lx bytes of ELF header\n\r",
+ (unsigned long)elf64ph->p_offset);
+#endif
+ vmlinux.addr += (unsigned long)elf64ph->p_offset;
+ vmlinux.size -= (unsigned long)elf64ph->p_offset;
+
+ flush_cache((void *)vmlinux.addr, vmlinux.size);
+
+ if (a1)
+ printf("initrd head: 0x%lx\n\r", *((u32 *)initrd.addr));
+
+ 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
+
+ kernel_entry( a1, a2, prom, NULL );
+
+ printf("Error: Linux kernel returned to zImage bootloader!\n\r");
+
+ exit();
+}
+
+struct memchunk {
+ unsigned int size;
+ unsigned int pad;
+ struct memchunk *next;
+};
+
+static struct memchunk *freechunks;
+
+void *zalloc(void *x, unsigned items, unsigned size)
+{
+ void *p;
+ struct memchunk **mpp, *mp;
+
+ size *= items;
+ size = _ALIGN(size, sizeof(struct memchunk));
+ heap_use += size;
+ if (heap_use > heap_max)
+ heap_max = heap_use;
+ for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
+ if (mp->size == size) {
+ *mpp = mp->next;
+ return mp;
+ }
+ }
+ p = avail_ram;
+ avail_ram += size;
+ if (avail_ram > avail_high)
+ avail_high = avail_ram;
+ if (avail_ram > end_avail) {
+ printf("oops... out of memory\n\r");
+ pause();
+ }
+ return p;
+}
+
+void zfree(void *x, void *addr, unsigned nb)
+{
+ struct memchunk *mp = addr;
+
+ nb = _ALIGN(nb, sizeof(struct memchunk));
+ heap_use -= nb;
+ if (avail_ram == addr + nb) {
+ avail_ram = addr;
+ return;
+ }
+ mp->size = nb;
+ mp->next = freechunks;
+ freechunks = mp;
+}
+
+#define HEAD_CRC 2
+#define EXTRA_FIELD 4
+#define ORIG_NAME 8
+#define COMMENT 0x10
+#define RESERVED 0xe0
+
+#define DEFLATED 8
+
+void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
+{
+ z_stream s;
+ int r, i, flags;
+
+ /* skip header */
+ i = 10;
+ flags = src[3];
+ if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
+ printf("bad gzipped data\n\r");
+ exit();
+ }
+ if ((flags & EXTRA_FIELD) != 0)
+ i = 12 + src[10] + (src[11] << 8);
+ if ((flags & ORIG_NAME) != 0)
+ while (src[i++] != 0)
+ ;
+ if ((flags & COMMENT) != 0)
+ while (src[i++] != 0)
+ ;
+ if ((flags & HEAD_CRC) != 0)
+ i += 2;
+ if (i >= *lenp) {
+ printf("gunzip: ran out of data in header\n\r");
+ exit();
+ }
+
+ s.zalloc = zalloc;
+ s.zfree = zfree;
+ r = inflateInit2(&s, -MAX_WBITS);
+ if (r != Z_OK) {
+ printf("inflateInit2 returned %d\n\r", r);
+ exit();
+ }
+ s.next_in = src + i;
+ s.avail_in = *lenp - i;
+ s.next_out = dst;
+ s.avail_out = dstlen;
+ r = inflate(&s, Z_FINISH);
+ if (r != Z_OK && r != Z_STREAM_END) {
+ printf("inflate returned %d msg: %s\n\r", r, s.msg);
+ exit();
+ }
+ *lenp = s.next_out - (unsigned char *) dst;
+ inflateEnd(&s);
+}
+
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