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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [alpha/] [boot/] [main.c] - Rev 1765
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/* * 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, unsigned long *kstk); int printk(const char * fmt, ...) { va_list args; int i, j, written, remaining, num_nl; static char buf[1024]; char * str; va_start(args, fmt); i = vsprintf(buf, fmt, args); va_end(args); /* expand \n into \r\n: */ num_nl = 0; for (j = 0; j < i; ++j) { if (buf[j] == '\n') ++num_nl; } remaining = i + num_nl; for (j = i - 1; j >= 0; --j) { buf[j + num_nl] = buf[j]; if (buf[j] == '\n') { --num_nl; buf[j + num_nl] = '\r'; } } str = buf; do { written = puts(str, remaining); remaining -= written; str += written; } while (remaining > 0); return i; } #define hwrpb (*INIT_HWRPB) /* * Find a physical address of a virtual object.. * * This is easy using the virtual page table address. */ struct pcb_struct * find_pa(unsigned long *vptb, struct pcb_struct * pcb) { unsigned long address = (unsigned long) pcb; unsigned long result; result = vptb[address >> 13]; result >>= 32; result <<= 13; result |= address & 0x1fff; return (struct pcb_struct *) 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. * * As we don't want it there anyway, we also move the L1 self-map * up as high as we can, so that the last entry in the L1 page table * maps the page tables. * * As a result, the OSF/1 pal-code will instead use a virtual page table * map located at 0xffffffe00000000. */ #define pcb_va ((struct pcb_struct *) 0x20000000) #define old_vptb (0x0000000200000000UL) #define new_vptb (0xfffffffe00000000UL) void pal_init(void) { unsigned long i, rev, sum; unsigned long *L1, *l; struct percpu_struct * percpu; struct pcb_struct * pcb_pa; /* Find the level 1 page table and duplicate it in high memory */ L1 = (unsigned long *) 0x200802000UL; /* (1<<33 | 1<<23 | 1<<13) */ L1[1023] = L1[1]; percpu = (struct percpu_struct *) (hwrpb.processor_offset + (unsigned long) &hwrpb), 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_pa = find_pa((unsigned long *) old_vptb, pcb_va); printk("Switching to OSF PAL-code .. "); /* * a0 = 2 (OSF) * a1 = return address, but we give the asm the virtual addr of the PCB * a2 = physical addr of PCB * a3 = new virtual page table pointer * a4 = KSP (but we give it 0, asm sets it) */ i = switch_to_osf_pal( 2, pcb_va, pcb_pa, new_vptb, 0); if (i) { printk("failed, code %ld\n", i); halt(); } rev = percpu->pal_revision = percpu->palcode_avail[2]; hwrpb.vptb = new_vptb; /* update checksum: */ sum = 0; for (l = (unsigned long *) &hwrpb; l < (unsigned long *) &hwrpb.chksum; ++l) sum += *l; hwrpb.chksum = sum; printk("Ok (rev %lx)\n", rev); /* remove the old virtual page-table mapping */ L1[1] = 0; flush_tlb_all(); } static inline long openboot(void) { char bootdev[256]; long result; result = dispatch(CCB_GET_ENV, ENV_BOOTED_DEV, bootdev, 255); if (result < 0) return result; return dispatch(CCB_OPEN, bootdev, result & 255); } static inline long close(long dev) { return dispatch(CCB_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 = dispatch(CCB_GET_ENV, ENV_BOOTED_FILE, bootfile, 255); if (result < 0) return result; result &= 255; bootfile[result] = '\0'; if (result) printk("Boot file specification (%s) not implemented\n", bootfile); return dispatch(CCB_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]; printk("Linux/AXP bootloader for Linux " UTS_RELEASE "\n"); if (hwrpb.pagesize != 8192) { printk("Expected 8kB pages, got %ldkB\n", hwrpb.pagesize >> 10); return; } pal_init(); dev = openboot(); if (dev < 0) { printk("Unable to open boot device: %016lx\n", dev); return; } dev &= 0xffffffff; printk("Loading vmlinux ..."); i = load(dev, START_ADDR, KERNEL_SIZE); close(dev); if (i != KERNEL_SIZE) { printk("Failed (%lx)\n", i); return; } nbytes = dispatch(CCB_GET_ENV, ENV_BOOTED_OSFLAGS, envval, sizeof(envval)); if (nbytes < 0) { nbytes = 0; } envval[nbytes] = '\0'; strcpy((char*)ZERO_PAGE, envval); printk(" Ok\nNow booting the kernel\n"); runkernel(); for (i = 0 ; i < 0x100000000 ; i++) /* nothing */; halt(); }