patch-2.4.19 linux-2.4.19/arch/ppc64/boot/zImage.c

• Lines: 363
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/ppc64/boot/zImage.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/ppc64/boot/zImage.c linux-2.4.19/arch/ppc64/boot/zImage.c
@@ -0,0 +1,362 @@
+/*
+ * 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.
+ */
+#define __KERNEL__
+#include "ppc32-types.h"
+#include "zlib.h"
+#include <linux/elf.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/bootinfo.h>
+
+void memmove(void *dst, void *im, int len);
+
+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);
+
+static struct bi_record *make_bi_recs(unsigned long);
+
+#define RAM_START	0x00000000
+#define RAM_END		(64<<20)
+
+/* Value picked to match that used by yaboot */
+#define PROG_START	0x01400000
+
+char *avail_ram;
+char *begin_avail, *end_avail;
+char *avail_high;
+unsigned int heap_use;
+unsigned int heap_max;
+
+extern char _end[];
+extern char _vmlinux_start[];
+extern char _vmlinux_end[];
+extern char _sysmap_start[];
+extern char _sysmap_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 sysmap  = {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 *,
+				struct bi_record *);
+
+
+int (*prom)(void *);
+
+void *chosen_handle;
+void *stdin;
+void *stdout;
+void *stderr;
+
+
+void
+start(unsigned long a1, unsigned long a2, void *promptr)
+{
+	unsigned long i, claim_addr, claim_size;
+	extern char _start;
+	struct bi_record *bi_recs;
+	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("zImage starting: loaded at 0x%x\n\r", (unsigned)&_start);
+
+#if 0
+	sysmap.size = (unsigned long)(_sysmap_end - _sysmap_start);
+	sysmap.memsize = sysmap.size;
+	if ( sysmap.size > 0 ) {
+		sysmap.addr = (RAM_END - sysmap.size) & ~0xFFF;
+		claim(sysmap.addr, RAM_END - sysmap.addr, 0);
+		printf("initial ramdisk moving 0x%lx <- 0x%lx (%lx bytes)\n\r",
+		       sysmap.addr, (unsigned long)_sysmap_start, sysmap.size);
+		memcpy((void *)sysmap.addr, (void *)_sysmap_start, sysmap.size);
+	}
+#endif
+
+	initrd.size = (unsigned long)(_initrd_end - _initrd_start);
+	initrd.memsize = initrd.size;
+	if ( initrd.size > 0 ) {
+		initrd.addr = (RAM_END - initrd.size) & ~0xFFF;
+		a1 = a2 = 0;
+		claim(initrd.addr, RAM_END - initrd.addr, 0);
+		printf("initial ramdisk moving 0x%lx <- 0x%lx (%lx bytes)\n\r",
+		       initrd.addr, (unsigned long)_initrd_start, initrd.size);
+		memcpy((void *)initrd.addr, (void *)_initrd_start, initrd.size);
+	}
+
+	vmlinuz.addr = (unsigned long)_vmlinux_start;
+	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
+	vmlinux.addr = (unsigned long)(void *)-1;
+	vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
+	vmlinux.memsize = vmlinux_memsize;
+
+	claim_size = vmlinux.memsize /* PPPBBB: + fudge for bi_recs */;
+	for(claim_addr = PROG_START; 
+	    claim_addr <= PROG_START * 8; 
+	    claim_addr += 0x100000) {
+		printf("    trying: 0x%08lx\n\r", claim_addr);
+		vmlinux.addr = (unsigned long)claim(claim_addr, claim_size, 0);
+		if ((void *)vmlinux.addr != (void *)-1) break;
+	}
+	if ((void *)vmlinux.addr == (void *)-1) {
+		printf("claim error, can't allocate kernel memory\n\r");
+		exit();
+	}
+
+	/* PPPBBB: should kernel always be gziped? */
+	if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
+		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);
+		gunzip((void *)vmlinux.addr, vmlinux.size,
+			(unsigned char *)vmlinuz.addr, (int *)&vmlinuz.size);
+		printf("done %lu bytes\n\r", vmlinuz.size);
+		printf("%u bytes of heap consumed, max in use %u\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;
+	}
+	printf("... skipping 0x%lx bytes of ELF header\n\r",
+			(unsigned long)elf64ph->p_offset);
+	vmlinux.addr += (unsigned long)elf64ph->p_offset;
+	vmlinux.size -= (unsigned long)elf64ph->p_offset;
+
+	flush_cache((void *)vmlinux.addr, vmlinux.memsize);
+
+	bi_recs = make_bi_recs(vmlinux.addr + vmlinux.memsize);
+
+	kernel_entry = (kernel_entry_t)vmlinux.addr;
+	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, (unsigned long)bi_recs);
+
+	kernel_entry( a1, a2, prom, bi_recs );
+
+	printf("Error: Linux kernel returned to zImage bootloader!\n\r");
+
+	exit();
+}
+
+static struct bi_record *
+make_bi_recs(unsigned long addr)
+{
+	struct bi_record *bi_recs;
+	struct bi_record *rec;
+
+	bi_recs = rec = bi_rec_init(addr);
+
+	rec = bi_rec_alloc(rec, 2);
+	rec->tag = BI_FIRST;
+	/* rec->data[0] = ...;	# Written below before return */
+	/* rec->data[1] = ...;	# Written below before return */
+
+	rec = bi_rec_alloc_bytes(rec, strlen("chrpboot")+1);
+	rec->tag = BI_BOOTLOADER_ID;
+	sprintf( (char *)rec->data, "chrpboot");
+
+	rec = bi_rec_alloc(rec, 2);
+	rec->tag = BI_MACHTYPE;
+	rec->data[0] = _MACH_pSeries;
+	rec->data[1] = 1;
+
+	if ( initrd.size > 0 ) {
+		rec = bi_rec_alloc(rec, 2);
+		rec->tag = BI_INITRD;
+		rec->data[0] = initrd.addr;
+		rec->data[1] = initrd.size;
+	}
+
+	if ( sysmap.size > 0 ) {
+		rec = bi_rec_alloc(rec, 2);
+		rec->tag = BI_SYSMAP;
+		rec->data[0] = (unsigned long)sysmap.addr;
+		rec->data[1] = (unsigned long)sysmap.size;
+	}
+
+	rec = bi_rec_alloc(rec, 1);
+	rec->tag = BI_LAST;
+	rec->data[0] = (bi_rec_field)bi_recs;
+
+	/* Save the _end_ address of the bi_rec's in the first bi_rec
+	 * data field for easy access by the kernel.
+	 */
+	bi_recs->data[0] = (bi_rec_field)rec;
+	bi_recs->data[1] = (bi_rec_field)rec + rec->size - (bi_rec_field)bi_recs;
+
+	return bi_recs;
+}
+
+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);
+}
+