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284 lines
8.4 KiB
284 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) Paul Mackerras 1997. |
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* |
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* Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner. |
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*/ |
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#include <stdarg.h> |
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#include <stddef.h> |
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#include "elf.h" |
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#include "page.h" |
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#include "string.h" |
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#include "stdio.h" |
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#include "ops.h" |
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#include "reg.h" |
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struct addr_range { |
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void *addr; |
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unsigned long size; |
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}; |
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#undef DEBUG |
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static struct addr_range prep_kernel(void) |
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{ |
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char elfheader[256]; |
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unsigned char *vmlinuz_addr = (unsigned char *)_vmlinux_start; |
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unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start; |
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void *addr = 0; |
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struct elf_info ei; |
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long len; |
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int uncompressed_image = 0; |
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len = partial_decompress(vmlinuz_addr, vmlinuz_size, |
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elfheader, sizeof(elfheader), 0); |
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/* assume uncompressed data if -1 is returned */ |
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if (len == -1) { |
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uncompressed_image = 1; |
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memcpy(elfheader, vmlinuz_addr, sizeof(elfheader)); |
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printf("No valid compressed data found, assume uncompressed data\n\r"); |
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} |
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if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei)) |
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fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r"); |
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if (platform_ops.image_hdr) |
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platform_ops.image_hdr(elfheader); |
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/* We need to alloc the memsize: gzip will expand the kernel |
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* text/data, then possible rubbish we don't care about. But |
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* the kernel bss must be claimed (it will be zero'd by the |
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* kernel itself) |
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*/ |
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printf("Allocating 0x%lx bytes for kernel...\n\r", ei.memsize); |
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if (platform_ops.vmlinux_alloc) { |
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addr = platform_ops.vmlinux_alloc(ei.memsize); |
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} else { |
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/* |
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* Check if the kernel image (without bss) would overwrite the |
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* bootwrapper. The device tree has been moved in fdt_init() |
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* to an area allocated with malloc() (somewhere past _end). |
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*/ |
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if ((unsigned long)_start < ei.loadsize) |
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fatal("Insufficient memory for kernel at address 0!" |
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" (_start=%p, uncompressed size=%08lx)\n\r", |
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_start, ei.loadsize); |
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if ((unsigned long)_end < ei.memsize) |
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fatal("The final kernel image would overwrite the " |
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"device tree\n\r"); |
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} |
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if (uncompressed_image) { |
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memcpy(addr, vmlinuz_addr + ei.elfoffset, ei.loadsize); |
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printf("0x%lx bytes of uncompressed data copied\n\r", |
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ei.loadsize); |
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goto out; |
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} |
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/* Finally, decompress the kernel */ |
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printf("Decompressing (0x%p <- 0x%p:0x%p)...\n\r", addr, |
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vmlinuz_addr, vmlinuz_addr+vmlinuz_size); |
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len = partial_decompress(vmlinuz_addr, vmlinuz_size, |
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addr, ei.loadsize, ei.elfoffset); |
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if (len < 0) |
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fatal("Decompression failed with error code %ld\n\r", len); |
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if (len != ei.loadsize) |
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fatal("Decompression error: got 0x%lx bytes, expected 0x%lx.\n\r", |
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len, ei.loadsize); |
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printf("Done! Decompressed 0x%lx bytes\n\r", len); |
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out: |
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flush_cache(addr, ei.loadsize); |
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return (struct addr_range){addr, ei.memsize}; |
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} |
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static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen, |
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unsigned long initrd_addr, |
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unsigned long initrd_size) |
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{ |
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/* If we have an image attached to us, it overrides anything |
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* supplied by the loader. */ |
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if (&_initrd_end > &_initrd_start) { |
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printf("Attached initrd image at 0x%p-0x%p\n\r", |
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_initrd_start, _initrd_end); |
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initrd_addr = (unsigned long)_initrd_start; |
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initrd_size = _initrd_end - _initrd_start; |
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} else if (initrd_size > 0) { |
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printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r", |
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initrd_addr, initrd_addr + initrd_size); |
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} |
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/* If there's no initrd at all, we're done */ |
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if (! initrd_size) |
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return (struct addr_range){0, 0}; |
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/* |
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* If the initrd is too low it will be clobbered when the |
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* kernel relocates to its final location. In this case, |
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* allocate a safer place and move it. |
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*/ |
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if (initrd_addr < vmlinux.size) { |
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void *old_addr = (void *)initrd_addr; |
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printf("Allocating 0x%lx bytes for initrd ...\n\r", |
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initrd_size); |
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initrd_addr = (unsigned long)malloc(initrd_size); |
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if (! initrd_addr) |
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fatal("Can't allocate memory for initial " |
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"ramdisk !\n\r"); |
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printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r", |
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initrd_addr, old_addr, initrd_size); |
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memmove((void *)initrd_addr, old_addr, initrd_size); |
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} |
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printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr)); |
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/* Tell the kernel initrd address via device tree */ |
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setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr)); |
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setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size)); |
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return (struct addr_range){(void *)initrd_addr, initrd_size}; |
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} |
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#ifdef __powerpc64__ |
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static void prep_esm_blob(struct addr_range vmlinux, void *chosen) |
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{ |
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unsigned long esm_blob_addr, esm_blob_size; |
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/* Do we have an ESM (Enter Secure Mode) blob? */ |
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if (&_esm_blob_end <= &_esm_blob_start) |
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return; |
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printf("Attached ESM blob at 0x%p-0x%p\n\r", |
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_esm_blob_start, _esm_blob_end); |
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esm_blob_addr = (unsigned long)_esm_blob_start; |
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esm_blob_size = _esm_blob_end - _esm_blob_start; |
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/* |
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* If the ESM blob is too low it will be clobbered when the |
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* kernel relocates to its final location. In this case, |
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* allocate a safer place and move it. |
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*/ |
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if (esm_blob_addr < vmlinux.size) { |
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void *old_addr = (void *)esm_blob_addr; |
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printf("Allocating 0x%lx bytes for esm_blob ...\n\r", |
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esm_blob_size); |
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esm_blob_addr = (unsigned long)malloc(esm_blob_size); |
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if (!esm_blob_addr) |
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fatal("Can't allocate memory for ESM blob !\n\r"); |
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printf("Relocating ESM blob 0x%lx <- 0x%p (0x%lx bytes)\n\r", |
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esm_blob_addr, old_addr, esm_blob_size); |
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memmove((void *)esm_blob_addr, old_addr, esm_blob_size); |
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} |
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/* Tell the kernel ESM blob address via device tree. */ |
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setprop_val(chosen, "linux,esm-blob-start", (u32)(esm_blob_addr)); |
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setprop_val(chosen, "linux,esm-blob-end", (u32)(esm_blob_addr + esm_blob_size)); |
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} |
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#else |
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static inline void prep_esm_blob(struct addr_range vmlinux, void *chosen) { } |
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#endif |
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/* A buffer that may be edited by tools operating on a zImage binary so as to |
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* edit the command line passed to vmlinux (by setting /chosen/bootargs). |
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* The buffer is put in it's own section so that tools may locate it easier. |
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*/ |
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static char cmdline[BOOT_COMMAND_LINE_SIZE] |
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__attribute__((__section__("__builtin_cmdline"))); |
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static void prep_cmdline(void *chosen) |
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{ |
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unsigned int getline_timeout = 5000; |
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int v; |
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int n; |
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/* Wait-for-input time */ |
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n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v)); |
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if (n == sizeof(v)) |
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getline_timeout = v; |
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if (cmdline[0] == '\0') |
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getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1); |
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printf("\n\rLinux/PowerPC load: %s", cmdline); |
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/* If possible, edit the command line */ |
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if (console_ops.edit_cmdline && getline_timeout) |
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console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout); |
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printf("\n\r"); |
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/* Put the command line back into the devtree for the kernel */ |
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setprop_str(chosen, "bootargs", cmdline); |
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} |
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struct platform_ops platform_ops; |
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struct dt_ops dt_ops; |
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struct console_ops console_ops; |
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struct loader_info loader_info; |
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void start(void) |
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{ |
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struct addr_range vmlinux, initrd; |
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kernel_entry_t kentry; |
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unsigned long ft_addr = 0; |
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void *chosen; |
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/* Do this first, because malloc() could clobber the loader's |
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* command line. Only use the loader command line if a |
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* built-in command line wasn't set by an external tool */ |
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if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0')) |
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memmove(cmdline, loader_info.cmdline, |
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min(loader_info.cmdline_len, BOOT_COMMAND_LINE_SIZE-1)); |
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if (console_ops.open && (console_ops.open() < 0)) |
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exit(); |
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if (platform_ops.fixups) |
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platform_ops.fixups(); |
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printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", |
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_start, get_sp()); |
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/* Ensure that the device tree has a /chosen node */ |
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chosen = finddevice("/chosen"); |
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if (!chosen) |
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chosen = create_node(NULL, "chosen"); |
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vmlinux = prep_kernel(); |
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initrd = prep_initrd(vmlinux, chosen, |
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loader_info.initrd_addr, loader_info.initrd_size); |
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prep_esm_blob(vmlinux, chosen); |
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prep_cmdline(chosen); |
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printf("Finalizing device tree..."); |
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if (dt_ops.finalize) |
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ft_addr = dt_ops.finalize(); |
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if (ft_addr) |
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printf(" flat tree at 0x%lx\n\r", ft_addr); |
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else |
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printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr); |
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if (console_ops.close) |
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console_ops.close(); |
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kentry = (kernel_entry_t) vmlinux.addr; |
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if (ft_addr) { |
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if(platform_ops.kentry) |
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platform_ops.kentry(ft_addr, vmlinux.addr); |
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else |
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kentry(ft_addr, 0, NULL); |
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} |
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else |
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kentry((unsigned long)initrd.addr, initrd.size, |
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loader_info.promptr); |
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/* console closed so printf in fatal below may not work */ |
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fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r"); |
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}
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