2 * arch/alpha/boot/main.c
4 * Copyright (C) 1994, 1995 Linus Torvalds
6 * This file is the bootloader for the Linux/AXP kernel
8 #include <linux/kernel.h>
9 #include <linux/slab.h>
10 #include <linux/string.h>
11 #include <generated/utsrelease.h>
14 #include <asm/system.h>
15 #include <asm/console.h>
16 #include <asm/hwrpb.h>
17 #include <asm/pgtable.h>
23 extern int vsprintf(char *, const char *, va_list);
24 extern unsigned long switch_to_osf_pal(unsigned long nr,
25 struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
27 struct hwrpb_struct *hwrpb = INIT_HWRPB;
28 static struct pcb_struct pcb_va[1];
31 * Find a physical address of a virtual object..
33 * This is easy using the virtual page table address.
37 find_pa(unsigned long *vptb, void *ptr)
39 unsigned long address = (unsigned long) ptr;
42 result = vptb[address >> 13];
45 result |= address & 0x1fff;
46 return (void *) result;
50 * This function moves into OSF/1 pal-code, and has a temporary
51 * PCB for that. The kernel proper should replace this PCB with
52 * the real one as soon as possible.
54 * The page table muckery in here depends on the fact that the boot
55 * code has the L1 page table identity-map itself in the second PTE
56 * in the L1 page table. Thus the L1-page is virtually addressable
57 * itself (through three levels) at virtual address 0x200802000.
60 #define VPTB ((unsigned long *) 0x200000000)
61 #define L1 ((unsigned long *) 0x200802000)
67 struct percpu_struct * percpu;
68 struct pcb_struct * pcb_pa;
70 /* Create the dummy PCB. */
73 pcb_va->ptbr = L1[1] >> 32;
80 pcb_pa = find_pa(VPTB, pcb_va);
84 * a1 = return address, but we give the asm the vaddr of the PCB
85 * a2 = physical addr of PCB
86 * a3 = new virtual page table pointer
87 * a4 = KSP (but the asm sets it)
89 srm_printk("Switching to OSF PAL-code .. ");
91 i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
93 srm_printk("failed, code %ld\n", i);
97 percpu = (struct percpu_struct *)
98 (INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
99 rev = percpu->pal_revision = percpu->palcode_avail[2];
101 srm_printk("Ok (rev %lx)\n", rev);
103 tbia(); /* do it directly in case we are SMP */
106 static inline long openboot(void)
111 result = callback_getenv(ENV_BOOTED_DEV, bootdev, 255);
114 return callback_open(bootdev, result & 255);
117 static inline long close(long dev)
119 return callback_close(dev);
122 static inline long load(long dev, unsigned long addr, unsigned long count)
126 long result, boot_size = &_end - (char *) BOOT_ADDR;
128 result = callback_getenv(ENV_BOOTED_FILE, bootfile, 255);
132 bootfile[result] = '\0';
134 srm_printk("Boot file specification (%s) not implemented\n",
136 return callback_read(dev, count, (void *)addr, boot_size/512 + 1);
142 static void runkernel(void)
144 __asm__ __volatile__(
148 : /* no outputs: it doesn't even return */
150 "r" (PAGE_SIZE + INIT_STACK));
153 void start_kernel(void)
160 srm_printk("Linux/AXP bootloader for Linux " UTS_RELEASE "\n");
161 if (INIT_HWRPB->pagesize != 8192) {
162 srm_printk("Expected 8kB pages, got %ldkB\n", INIT_HWRPB->pagesize >> 10);
168 srm_printk("Unable to open boot device: %016lx\n", dev);
172 srm_printk("Loading vmlinux ...");
173 i = load(dev, START_ADDR, KERNEL_SIZE);
175 if (i != KERNEL_SIZE) {
176 srm_printk("Failed (%lx)\n", i);
180 nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
184 envval[nbytes] = '\0';
185 strcpy((char*)ZERO_PGE, envval);
187 srm_printk(" Ok\nNow booting the kernel\n");
189 for (i = 0 ; i < 0x100000000 ; i++)