1 files changed, 191 insertions, 0 deletions

diff --git a/arch/alpha/boot/main.c b/arch/alpha/boot/main.c
new file mode 100644
index 000000000000..78c9b0b6eea7
--- /dev/null
+++ b/arch/alpha/boot/main.c
@@ -0,0 +1,191 @@
+/*
+ * arch/alpha/boot/main.c
+ *
+ * Copyright (C) 1994, 1995 Linus Torvalds
+ *
+ * This file is the bootloader for the Linux/AXP kernel
+ */
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/version.h>
+#include <linux/mm.h>
+
+#include <asm/system.h>
+#include <asm/console.h>
+#include <asm/hwrpb.h>
+#include <asm/pgtable.h>
+
+#include <stdarg.h>
+
+#include "ksize.h"
+
+extern int vsprintf(char *, const char *, va_list);
+extern unsigned long switch_to_osf_pal(unsigned long nr,
+        struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
+        unsigned long *vptb);
+struct hwrpb_struct *hwrpb = INIT_HWRPB;
+static struct pcb_struct pcb_va[1];
+
+/*
+ * Find a physical address of a virtual object..
+ *
+ * This is easy using the virtual page table address.
+ */
+
+static inline void *
+find_pa(unsigned long *vptb, void *ptr)
+{
+        unsigned long address = (unsigned long) ptr;
+        unsigned long result;
+
+        result = vptb[address >> 13];
+        result >>= 32;
+        result <<= 13;
+        result |= address & 0x1fff;
+        return (void *) result;
+}       
+
+/*
+ * This function moves into OSF/1 pal-code, and has a temporary
+ * PCB for that. The kernel proper should replace this PCB with
+ * the real one as soon as possible.
+ *
+ * The page table muckery in here depends on the fact that the boot
+ * code has the L1 page table identity-map itself in the second PTE
+ * in the L1 page table. Thus the L1-page is virtually addressable
+ * itself (through three levels) at virtual address 0x200802000.
+ */
+
+#define VPTB    ((unsigned long *) 0x200000000)
+#define L1      ((unsigned long *) 0x200802000)
+
+void
+pal_init(void)
+{
+        unsigned long i, rev;
+        struct percpu_struct * percpu;
+        struct pcb_struct * pcb_pa;
+
+        /* Create the dummy PCB.  */
+        pcb_va->ksp = 0;
+        pcb_va->usp = 0;
+        pcb_va->ptbr = L1[1] >> 32;
+        pcb_va->asn = 0;
+        pcb_va->pcc = 0;
+        pcb_va->unique = 0;
+        pcb_va->flags = 1;
+        pcb_va->res1 = 0;
+        pcb_va->res2 = 0;
+        pcb_pa = find_pa(VPTB, pcb_va);
+
+        /*
+         * a0 = 2 (OSF)
+         * a1 = return address, but we give the asm the vaddr of the PCB
+         * a2 = physical addr of PCB
+         * a3 = new virtual page table pointer
+         * a4 = KSP (but the asm sets it)
+         */
+        srm_printk("Switching to OSF PAL-code .. ");
+
+        i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
+        if (i) {
+                srm_printk("failed, code %ld\n", i);
+                __halt();
+        }
+
+        percpu = (struct percpu_struct *)
+                (INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
+        rev = percpu->pal_revision = percpu->palcode_avail[2];
+
+        srm_printk("Ok (rev %lx)\n", rev);
+
+        tbia(); /* do it directly in case we are SMP */
+}
+
+static inline long openboot(void)
+{
+        char bootdev[256];
+        long result;
+
+        result = callback_getenv(ENV_BOOTED_DEV, bootdev, 255);
+        if (result < 0)
+                return result;
+        return callback_open(bootdev, result & 255);
+}
+
+static inline long close(long dev)
+{
+        return callback_close(dev);
+}
+
+static inline long load(long dev, unsigned long addr, unsigned long count)
+{
+        char bootfile[256];
+        extern char _end;
+        long result, boot_size = &_end - (char *) BOOT_ADDR;
+
+        result = callback_getenv(ENV_BOOTED_FILE, bootfile, 255);
+        if (result < 0)
+                return result;
+        result &= 255;
+        bootfile[result] = '\0';
+        if (result)
+                srm_printk("Boot file specification (%s) not implemented\n",
+                       bootfile);
+        return callback_read(dev, count, addr, boot_size/512 + 1);
+}
+
+/*
+ * Start the kernel.
+ */
+static void runkernel(void)
+{
+        __asm__ __volatile__(
+                "bis %1,%1,$30\n\t"
+                "bis %0,%0,$26\n\t"
+                "ret ($26)"
+                : /* no outputs: it doesn't even return */
+                : "r" (START_ADDR),
+                  "r" (PAGE_SIZE + INIT_STACK));
+}
+
+void start_kernel(void)
+{
+        long i;
+        long dev;
+        int nbytes;
+        char envval[256];
+
+        srm_printk("Linux/AXP bootloader for Linux " UTS_RELEASE "\n");
+        if (INIT_HWRPB->pagesize != 8192) {
+                srm_printk("Expected 8kB pages, got %ldkB\n", INIT_HWRPB->pagesize >> 10);
+                return;
+        }
+        pal_init();
+        dev = openboot();
+        if (dev < 0) {
+                srm_printk("Unable to open boot device: %016lx\n", dev);
+                return;
+        }
+        dev &= 0xffffffff;
+        srm_printk("Loading vmlinux ...");
+        i = load(dev, START_ADDR, KERNEL_SIZE);
+        close(dev);
+        if (i != KERNEL_SIZE) {
+                srm_printk("Failed (%lx)\n", i);
+                return;
+        }
+
+        nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
+        if (nbytes < 0) {
+                nbytes = 0;
+        }
+        envval[nbytes] = '\0';
+        strcpy((char*)ZERO_PGE, envval);
+
+        srm_printk(" Ok\nNow booting the kernel\n");
+        runkernel();
+        for (i = 0 ; i < 0x100000000 ; i++)
+                /* nothing */;
+        __halt();
+}