aboutsummaryrefslogtreecommitdiff
path: root/arch/ia64/hp/sim/boot/bootloader.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ia64/hp/sim/boot/bootloader.c
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/ia64/hp/sim/boot/bootloader.c')
-rw-r--r--arch/ia64/hp/sim/boot/bootloader.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/ia64/hp/sim/boot/bootloader.c b/arch/ia64/hp/sim/boot/bootloader.c
new file mode 100644
index 000000000000..51a7b7b4dd0e
--- /dev/null
+++ b/arch/ia64/hp/sim/boot/bootloader.c
@@ -0,0 +1,176 @@
+/*
+ * arch/ia64/hp/sim/boot/bootloader.c
+ *
+ * Loads an ELF kernel.
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ * Stephane Eranian <eranian@hpl.hp.com>
+ *
+ * 01/07/99 S.Eranian modified to pass command line arguments to kernel
+ */
+struct task_struct; /* forward declaration for elf.h */
+
+#include <linux/config.h>
+#include <linux/elf.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include <asm/elf.h>
+#include <asm/intrinsics.h>
+#include <asm/pal.h>
+#include <asm/pgtable.h>
+#include <asm/sal.h>
+#include <asm/system.h>
+
+#include "ssc.h"
+
+struct disk_req {
+ unsigned long addr;
+ unsigned len;
+};
+
+struct disk_stat {
+ int fd;
+ unsigned count;
+};
+
+extern void jmp_to_kernel (unsigned long bp, unsigned long e_entry);
+extern struct ia64_boot_param *sys_fw_init (const char *args, int arglen);
+extern void debug_break (void);
+
+static void
+cons_write (const char *buf)
+{
+ unsigned long ch;
+
+ while ((ch = *buf++) != '\0') {
+ ssc(ch, 0, 0, 0, SSC_PUTCHAR);
+ if (ch == '\n')
+ ssc('\r', 0, 0, 0, SSC_PUTCHAR);
+ }
+}
+
+#define MAX_ARGS 32
+
+void
+start_bootloader (void)
+{
+ static char mem[4096];
+ static char buffer[1024];
+ unsigned long off;
+ int fd, i;
+ struct disk_req req;
+ struct disk_stat stat;
+ struct elfhdr *elf;
+ struct elf_phdr *elf_phdr; /* program header */
+ unsigned long e_entry, e_phoff, e_phnum;
+ register struct ia64_boot_param *bp;
+ char *kpath, *args;
+ long arglen = 0;
+
+ ssc(0, 0, 0, 0, SSC_CONSOLE_INIT);
+
+ /*
+ * S.Eranian: extract the commandline argument from the simulator
+ *
+ * The expected format is as follows:
+ *
+ * kernelname args...
+ *
+ * Both are optional but you can't have the second one without the first.
+ */
+ arglen = ssc((long) buffer, 0, 0, 0, SSC_GET_ARGS);
+
+ kpath = "vmlinux";
+ args = buffer;
+ if (arglen > 0) {
+ kpath = buffer;
+ while (*args != ' ' && *args != '\0')
+ ++args, --arglen;
+ if (*args == ' ')
+ *args++ = '\0', --arglen;
+ }
+
+ if (arglen <= 0) {
+ args = "";
+ arglen = 1;
+ }
+
+ fd = ssc((long) kpath, 1, 0, 0, SSC_OPEN);
+
+ if (fd < 0) {
+ cons_write(kpath);
+ cons_write(": file not found, reboot now\n");
+ for(;;);
+ }
+ stat.fd = fd;
+ off = 0;
+
+ req.len = sizeof(mem);
+ req.addr = (long) mem;
+ ssc(fd, 1, (long) &req, off, SSC_READ);
+ ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION);
+
+ elf = (struct elfhdr *) mem;
+ if (elf->e_ident[0] == 0x7f && strncmp(elf->e_ident + 1, "ELF", 3) != 0) {
+ cons_write("not an ELF file\n");
+ return;
+ }
+ if (elf->e_type != ET_EXEC) {
+ cons_write("not an ELF executable\n");
+ return;
+ }
+ if (!elf_check_arch(elf)) {
+ cons_write("kernel not for this processor\n");
+ return;
+ }
+
+ e_entry = elf->e_entry;
+ e_phnum = elf->e_phnum;
+ e_phoff = elf->e_phoff;
+
+ cons_write("loading ");
+ cons_write(kpath);
+ cons_write("...\n");
+
+ for (i = 0; i < e_phnum; ++i) {
+ req.len = sizeof(*elf_phdr);
+ req.addr = (long) mem;
+ ssc(fd, 1, (long) &req, e_phoff, SSC_READ);
+ ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION);
+ if (stat.count != sizeof(*elf_phdr)) {
+ cons_write("failed to read phdr\n");
+ return;
+ }
+ e_phoff += sizeof(*elf_phdr);
+
+ elf_phdr = (struct elf_phdr *) mem;
+
+ if (elf_phdr->p_type != PT_LOAD)
+ continue;
+
+ req.len = elf_phdr->p_filesz;
+ req.addr = __pa(elf_phdr->p_paddr);
+ ssc(fd, 1, (long) &req, elf_phdr->p_offset, SSC_READ);
+ ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION);
+ memset((char *)__pa(elf_phdr->p_paddr) + elf_phdr->p_filesz, 0,
+ elf_phdr->p_memsz - elf_phdr->p_filesz);
+ }
+ ssc(fd, 0, 0, 0, SSC_CLOSE);
+
+ cons_write("starting kernel...\n");
+
+ /* fake an I/O base address: */
+ ia64_setreg(_IA64_REG_AR_KR0, 0xffffc000000UL);
+
+ bp = sys_fw_init(args, arglen);
+
+ ssc(0, (long) kpath, 0, 0, SSC_LOAD_SYMBOLS);
+
+ debug_break();
+ jmp_to_kernel((unsigned long) bp, e_entry);
+
+ cons_write("kernel returned!\n");
+ ssc(-1, 0, 0, 0, SSC_EXIT);
+}