From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- grub-core/loader/powerpc/ieee1275/linux.c | 393 ++++++++++++++++++++++++++++++ 1 file changed, 393 insertions(+) create mode 100644 grub-core/loader/powerpc/ieee1275/linux.c (limited to 'grub-core/loader/powerpc/ieee1275/linux.c') diff --git a/grub-core/loader/powerpc/ieee1275/linux.c b/grub-core/loader/powerpc/ieee1275/linux.c new file mode 100644 index 0000000..818b2a8 --- /dev/null +++ b/grub-core/loader/powerpc/ieee1275/linux.c @@ -0,0 +1,393 @@ +/* linux.c - boot Linux */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2003,2004,2005,2007,2009 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define ELF32_LOADMASK (0xc0000000UL) +#define ELF64_LOADMASK (0xc000000000000000ULL) + +static grub_dl_t my_mod; + +static int loaded; + +static grub_addr_t initrd_addr; +static grub_size_t initrd_size; + +static grub_addr_t linux_addr; +static grub_addr_t linux_entry; +static grub_size_t linux_size; + +static char *linux_args; + +typedef void (*kernel_entry_t) (void *, unsigned long, int (void *), + unsigned long, unsigned long); + +/* Context for grub_linux_claimmap_iterate. */ +struct grub_linux_claimmap_iterate_ctx +{ + grub_addr_t target; + grub_size_t size; + grub_size_t align; + grub_addr_t found_addr; +}; + +/* Helper for grub_linux_claimmap_iterate. */ +static int +alloc_mem (grub_uint64_t addr, grub_uint64_t len, grub_memory_type_t type, + void *data) +{ + struct grub_linux_claimmap_iterate_ctx *ctx = data; + + grub_uint64_t end = addr + len; + addr = ALIGN_UP (addr, ctx->align); + ctx->target = ALIGN_UP (ctx->target, ctx->align); + + /* Target above the memory chunk. */ + if (type != GRUB_MEMORY_AVAILABLE || ctx->target > end) + return 0; + + /* Target inside the memory chunk. */ + if (ctx->target >= addr && ctx->target < end && + ctx->size <= end - ctx->target) + { + if (grub_claimmap (ctx->target, ctx->size) == GRUB_ERR_NONE) + { + ctx->found_addr = ctx->target; + return 1; + } + grub_print_error (); + } + /* Target below the memory chunk. */ + if (ctx->target < addr && addr + ctx->size <= end) + { + if (grub_claimmap (addr, ctx->size) == GRUB_ERR_NONE) + { + ctx->found_addr = addr; + return 1; + } + grub_print_error (); + } + return 0; +} + +static grub_addr_t +grub_linux_claimmap_iterate (grub_addr_t target, grub_size_t size, + grub_size_t align) +{ + struct grub_linux_claimmap_iterate_ctx ctx = { + .target = target, + .size = size, + .align = align, + .found_addr = (grub_addr_t) -1 + }; + + if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_FORCE_CLAIM)) + { + grub_uint64_t addr = target; + if (addr < GRUB_IEEE1275_STATIC_HEAP_START + + GRUB_IEEE1275_STATIC_HEAP_LEN) + addr = GRUB_IEEE1275_STATIC_HEAP_START + + GRUB_IEEE1275_STATIC_HEAP_LEN; + addr = ALIGN_UP (addr, align); + if (grub_claimmap (addr, size) == GRUB_ERR_NONE) + return addr; + return (grub_addr_t) -1; + } + + + grub_machine_mmap_iterate (alloc_mem, &ctx); + + return ctx.found_addr; +} + +static grub_err_t +grub_linux_boot (void) +{ + kernel_entry_t linuxmain; + grub_ssize_t actual; + + grub_arch_sync_caches ((void *) linux_addr, linux_size); + /* Set the command line arguments. */ + grub_ieee1275_set_property (grub_ieee1275_chosen, "bootargs", linux_args, + grub_strlen (linux_args) + 1, &actual); + + grub_dprintf ("loader", "Entry point: 0x%x\n", linux_entry); + grub_dprintf ("loader", "Initrd at: 0x%x, size 0x%x\n", initrd_addr, + initrd_size); + grub_dprintf ("loader", "Boot arguments: %s\n", linux_args); + grub_dprintf ("loader", "Jumping to Linux...\n"); + + /* Boot the kernel. */ + linuxmain = (kernel_entry_t) linux_entry; + linuxmain ((void *) initrd_addr, initrd_size, grub_ieee1275_entry_fn, 0, 0); + + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_linux_release_mem (void) +{ + grub_free (linux_args); + linux_args = 0; + + if (linux_addr && grub_ieee1275_release (linux_addr, linux_size)) + return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory"); + + if (initrd_addr && grub_ieee1275_release (initrd_addr, initrd_size)) + return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory"); + + linux_addr = 0; + initrd_addr = 0; + + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_linux_unload (void) +{ + grub_err_t err; + + err = grub_linux_release_mem (); + grub_dl_unref (my_mod); + + loaded = 0; + + return err; +} + +static grub_err_t +grub_linux_load32 (grub_elf_t elf, const char *filename) +{ + Elf32_Addr base_addr; + grub_addr_t seg_addr; + grub_uint32_t align; + grub_uint32_t offset; + Elf32_Addr entry; + + linux_size = grub_elf32_size (elf, &base_addr, &align); + if (linux_size == 0) + return grub_errno; + /* Pad it; the kernel scribbles over memory beyond its load address. */ + linux_size += 0x100000; + + /* Linux's entry point incorrectly contains a virtual address. */ + entry = elf->ehdr.ehdr32.e_entry & ~ELF32_LOADMASK; + + /* Linux's incorrectly contains a virtual address. */ + base_addr &= ~ELF32_LOADMASK; + offset = entry - base_addr; + + /* On some systems, firmware occupies the memory we're trying to use. + * Happily, Linux can be loaded anywhere (it relocates itself). Iterate + * until we find an open area. */ + seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF32_LOADMASK, linux_size, align); + if (seg_addr == (grub_addr_t) -1) + return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory"); + + linux_entry = seg_addr + offset; + linux_addr = seg_addr; + + /* Now load the segments into the area we claimed. */ + return grub_elf32_load (elf, filename, (void *) (seg_addr - base_addr), GRUB_ELF_LOAD_FLAGS_30BITS, 0, 0); +} + +static grub_err_t +grub_linux_load64 (grub_elf_t elf, const char *filename) +{ + Elf64_Addr base_addr; + grub_addr_t seg_addr; + grub_uint64_t align; + grub_uint64_t offset; + Elf64_Addr entry; + + linux_size = grub_elf64_size (elf, &base_addr, &align); + if (linux_size == 0) + return grub_errno; + /* Pad it; the kernel scribbles over memory beyond its load address. */ + linux_size += 0x100000; + + base_addr &= ~ELF64_LOADMASK; + entry = elf->ehdr.ehdr64.e_entry & ~ELF64_LOADMASK; + offset = entry - base_addr; + /* Linux's incorrectly contains a virtual address. */ + + /* On some systems, firmware occupies the memory we're trying to use. + * Happily, Linux can be loaded anywhere (it relocates itself). Iterate + * until we find an open area. */ + seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF64_LOADMASK, linux_size, align); + if (seg_addr == (grub_addr_t) -1) + return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory"); + + linux_entry = seg_addr + offset; + linux_addr = seg_addr; + + /* Now load the segments into the area we claimed. */ + return grub_elf64_load (elf, filename, (void *) (grub_addr_t) (seg_addr - base_addr), GRUB_ELF_LOAD_FLAGS_62BITS, 0, 0); +} + +static grub_err_t +grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_elf_t elf = 0; + int size; + + grub_dl_ref (my_mod); + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto out; + } + + elf = grub_elf_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL); + if (! elf) + goto out; + + if (elf->ehdr.ehdr32.e_type != ET_EXEC && elf->ehdr.ehdr32.e_type != ET_DYN) + { + grub_error (GRUB_ERR_UNKNOWN_OS, + N_("this ELF file is not of the right type")); + goto out; + } + + /* Release the previously used memory. */ + grub_loader_unset (); + + if (grub_elf_is_elf32 (elf)) + grub_linux_load32 (elf, argv[0]); + else + if (grub_elf_is_elf64 (elf)) + grub_linux_load64 (elf, argv[0]); + else + { + grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("invalid arch-dependent ELF magic")); + goto out; + } + + size = grub_loader_cmdline_size(argc, argv); + linux_args = grub_malloc (size + sizeof (LINUX_IMAGE)); + if (! linux_args) + goto out; + + /* Create kernel command line. */ + grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE)); + if (grub_create_loader_cmdline (argc, argv, linux_args + sizeof (LINUX_IMAGE) - 1, + size, GRUB_VERIFY_KERNEL_CMDLINE)) + goto out; + +out: + + if (elf) + grub_elf_close (elf); + + if (grub_errno != GRUB_ERR_NONE) + { + grub_linux_release_mem (); + grub_dl_unref (my_mod); + loaded = 0; + } + else + { + grub_loader_set (grub_linux_boot, grub_linux_unload, 1); + initrd_addr = 0; + loaded = 1; + } + + return grub_errno; +} + +static grub_err_t +grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_size_t size = 0; + grub_addr_t first_addr; + grub_addr_t addr; + struct grub_linux_initrd_context initrd_ctx = { 0, 0, 0 }; + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + if (!loaded) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first")); + goto fail; + } + + if (grub_initrd_init (argc, argv, &initrd_ctx)) + goto fail; + + size = grub_get_initrd_size (&initrd_ctx); + + first_addr = linux_addr + linux_size; + + /* Attempt to claim at a series of addresses until successful in + the same way that grub_rescue_cmd_linux does. */ + addr = grub_linux_claimmap_iterate (first_addr, size, 0x100000); + if (addr == (grub_addr_t) -1) + goto fail; + + grub_dprintf ("loader", "Loading initrd at 0x%x, size 0x%x\n", addr, size); + + if (grub_initrd_load (&initrd_ctx, argv, (void *) addr)) + goto fail; + + initrd_addr = addr; + initrd_size = size; + + fail: + grub_initrd_close (&initrd_ctx); + + return grub_errno; +} + +static grub_command_t cmd_linux, cmd_initrd; + +GRUB_MOD_INIT(linux) +{ + cmd_linux = grub_register_command ("linux", grub_cmd_linux, + 0, N_("Load Linux.")); + cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, + 0, N_("Load initrd.")); + my_mod = mod; +} + +GRUB_MOD_FINI(linux) +{ + grub_unregister_command (cmd_linux); + grub_unregister_command (cmd_initrd); +} -- cgit v1.2.3