diff options
Diffstat (limited to 'grub-core/kern/i386/qemu')
| -rw-r--r-- | grub-core/kern/i386/qemu/init.c | 276 | ||||
| -rw-r--r-- | grub-core/kern/i386/qemu/mmap.c | 107 | ||||
| -rw-r--r-- | grub-core/kern/i386/qemu/startup.S | 75 |
3 files changed, 458 insertions, 0 deletions
diff --git a/grub-core/kern/i386/qemu/init.c b/grub-core/kern/i386/qemu/init.c new file mode 100644 index 0000000..271b6fb --- /dev/null +++ b/grub-core/kern/i386/qemu/init.c @@ -0,0 +1,276 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2013 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 <http://www.gnu.org/licenses/>. + */ + +#include <grub/kernel.h> +#include <grub/mm.h> +#include <grub/machine/time.h> +#include <grub/machine/memory.h> +#include <grub/machine/console.h> +#include <grub/offsets.h> +#include <grub/types.h> +#include <grub/err.h> +#include <grub/dl.h> +#include <grub/misc.h> +#include <grub/loader.h> +#include <grub/env.h> +#include <grub/cache.h> +#include <grub/time.h> +#include <grub/symbol.h> +#include <grub/cpu/io.h> +#include <grub/cpu/floppy.h> +#include <grub/cpu/tsc.h> +#include <grub/machine/kernel.h> +#include <grub/pci.h> + +extern grub_uint8_t _start[]; +extern grub_uint8_t _end[]; +extern grub_uint8_t _edata[]; + +void __attribute__ ((noreturn)) +grub_exit (void) +{ + /* We can't use grub_fatal() in this function. This would create an infinite + loop, since grub_fatal() calls grub_abort() which in turn calls grub_exit(). */ + while (1) + grub_cpu_idle (); +} + +grub_addr_t grub_modbase; + +/* Helper for grub_machine_init. */ +static int +heap_init (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type, + void *data __attribute__ ((unused))) +{ + grub_uint64_t begin = addr, end = addr + size; + +#if GRUB_CPU_SIZEOF_VOID_P == 4 + /* Restrict ourselves to 32-bit memory space. */ + if (begin > GRUB_ULONG_MAX) + return 0; + if (end > GRUB_ULONG_MAX) + end = GRUB_ULONG_MAX; +#endif + + if (type != GRUB_MEMORY_AVAILABLE) + return 0; + + /* Avoid the lower memory. */ + if (begin < GRUB_MEMORY_MACHINE_LOWER_SIZE) + begin = GRUB_MEMORY_MACHINE_LOWER_SIZE; + + if (end <= begin) + return 0; + + grub_mm_init_region ((void *) (grub_addr_t) begin, (grub_size_t) (end - begin)); + + return 0; +} + +struct resource +{ + grub_pci_device_t dev; + grub_size_t size; + unsigned type:4; + unsigned bar:3; +}; + +struct iterator_ctx +{ + struct resource *resources; + grub_size_t nresources; +}; + +/* We don't support bridges, so can't have more than 32 devices. */ +#define MAX_DEVICES 32 + +static int +find_resources (grub_pci_device_t dev, + grub_pci_id_t pciid __attribute__ ((unused)), + void *data) +{ + struct iterator_ctx *ctx = data; + int bar; + + if (ctx->nresources >= MAX_DEVICES * 6) + return 1; + + for (bar = 0; bar < 6; bar++) + { + grub_pci_address_t addr; + grub_uint32_t ones, zeros, mask; + struct resource *res; + addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0 + + 4 * bar); + grub_pci_write (addr, 0xffffffff); + grub_pci_read (addr); + ones = grub_pci_read (addr); + grub_pci_write (addr, 0); + grub_pci_read (addr); + zeros = grub_pci_read (addr); + if (ones == zeros) + continue; + res = &ctx->resources[ctx->nresources++]; + if ((zeros & GRUB_PCI_ADDR_SPACE_MASK) == GRUB_PCI_ADDR_SPACE_IO) + mask = GRUB_PCI_ADDR_SPACE_MASK; + else + mask = (GRUB_PCI_ADDR_MEM_TYPE_MASK | GRUB_PCI_ADDR_SPACE_MASK | GRUB_PCI_ADDR_MEM_PREFETCH); + + res->type = ones & mask; + res->dev = dev; + res->bar = bar; + res->size = (~((zeros ^ ones)) | mask) + 1; + if ((zeros & (GRUB_PCI_ADDR_MEM_TYPE_MASK | GRUB_PCI_ADDR_SPACE_MASK)) + == (GRUB_PCI_ADDR_SPACE_MEMORY | GRUB_PCI_ADDR_MEM_TYPE_64)) + bar++; + } + return 0; +} + +static int +enable_cards (grub_pci_device_t dev, + grub_pci_id_t pciid __attribute__ ((unused)), + void *data __attribute__ ((unused))) +{ + grub_uint16_t cmd = 0; + grub_pci_address_t addr; + grub_uint32_t class; + int bar; + + for (bar = 0; bar < 6; bar++) + { + grub_uint32_t val; + addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0 + + 4 * bar); + val = grub_pci_read (addr); + if (!val) + continue; + if ((val & GRUB_PCI_ADDR_SPACE_MASK) == GRUB_PCI_ADDR_SPACE_IO) + cmd |= GRUB_PCI_COMMAND_IO_ENABLED; + else + cmd |= GRUB_PCI_COMMAND_MEM_ENABLED; + } + + class = (grub_pci_read (addr) >> 16) & 0xffff; + + if (class == GRUB_PCI_CLASS_SUBCLASS_VGA) + cmd |= GRUB_PCI_COMMAND_IO_ENABLED + | GRUB_PCI_COMMAND_MEM_ENABLED; + + if (class == GRUB_PCI_CLASS_SUBCLASS_USB) + return 0; + + addr = grub_pci_make_address (dev, GRUB_PCI_REG_COMMAND); + grub_pci_write (addr, cmd); + + return 0; +} + +static void +grub_pci_assign_addresses (void) +{ + struct iterator_ctx ctx; + + { + struct resource resources[MAX_DEVICES * 6]; + int done; + unsigned i; + ctx.nresources = 0; + ctx.resources = resources; + grub_uint32_t memptr = 0xf0000000; + grub_uint16_t ioptr = 0x1000; + + grub_pci_iterate (find_resources, &ctx); + /* FIXME: do we need a better sort here? */ + do + { + done = 0; + for (i = 0; i + 1 < ctx.nresources; i++) + if (resources[i].size < resources[i+1].size) + { + struct resource t; + t = resources[i]; + resources[i] = resources[i+1]; + resources[i+1] = t; + done = 1; + } + } + while (done); + + for (i = 0; i < ctx.nresources; i++) + { + grub_pci_address_t addr; + addr = grub_pci_make_address (resources[i].dev, + GRUB_PCI_REG_ADDRESS_REG0 + + 4 * resources[i].bar); + if ((resources[i].type & GRUB_PCI_ADDR_SPACE_MASK) + == GRUB_PCI_ADDR_SPACE_IO) + { + grub_pci_write (addr, ioptr | resources[i].type); + ioptr += resources[i].size; + } + else + { + grub_pci_write (addr, memptr | resources[i].type); + memptr += resources[i].size; + if ((resources[i].type & (GRUB_PCI_ADDR_MEM_TYPE_MASK + | GRUB_PCI_ADDR_SPACE_MASK)) + == (GRUB_PCI_ADDR_SPACE_MEMORY | GRUB_PCI_ADDR_MEM_TYPE_64)) + { + addr = grub_pci_make_address (resources[i].dev, + GRUB_PCI_REG_ADDRESS_REG0 + + 4 * resources[i].bar + 4); + grub_pci_write (addr, 0); + } + } + } + grub_pci_iterate (enable_cards, NULL); + } +} + +void +grub_machine_init (void) +{ + grub_modbase = grub_core_entry_addr + (_edata - _start); + + grub_pci_assign_addresses (); + + grub_qemu_init_cirrus (); + + grub_vga_text_init (); + + grub_machine_mmap_init (); + grub_machine_mmap_iterate (heap_init, NULL); + + + grub_tsc_init (); +} + +void +grub_machine_get_bootlocation (char **device __attribute__ ((unused)), + char **path __attribute__ ((unused))) +{ +} + +void +grub_machine_fini (int flags) +{ + if (flags & GRUB_LOADER_FLAG_NORETURN) + grub_vga_text_fini (); + grub_stop_floppy (); +} diff --git a/grub-core/kern/i386/qemu/mmap.c b/grub-core/kern/i386/qemu/mmap.c new file mode 100644 index 0000000..f449637 --- /dev/null +++ b/grub-core/kern/i386/qemu/mmap.c @@ -0,0 +1,107 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 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 <http://www.gnu.org/licenses/>. + */ + +#include <grub/i386/memory.h> +#include <grub/machine/memory.h> +#include <grub/machine/boot.h> +#include <grub/types.h> +#include <grub/err.h> +#include <grub/misc.h> +#include <grub/cmos.h> +#include <grub/offsets.h> + +#define QEMU_CMOS_MEMSIZE_HIGH 0x35 +#define QEMU_CMOS_MEMSIZE_LOW 0x34 + +#define QEMU_CMOS_MEMSIZE2_HIGH 0x31 +#define QEMU_CMOS_MEMSIZE2_LOW 0x30 + +#define min(a,b) ((a) > (b) ? (b) : (a)) + +extern char _start[]; +extern char _end[]; + +static grub_uint64_t mem_size, above_4g; + +void +grub_machine_mmap_init (void) +{ + grub_uint8_t high, low, b, c, d; + grub_cmos_read (QEMU_CMOS_MEMSIZE_HIGH, &high); + grub_cmos_read (QEMU_CMOS_MEMSIZE_LOW, &low); + mem_size = ((grub_uint64_t) high) << 24 + | ((grub_uint64_t) low) << 16; + if (mem_size > 0) + { + /* Don't ask... */ + mem_size += (16 * 1024 * 1024); + } + else + { + grub_cmos_read (QEMU_CMOS_MEMSIZE2_HIGH, &high); + grub_cmos_read (QEMU_CMOS_MEMSIZE2_LOW, &low); + mem_size + = ((((grub_uint64_t) high) << 18) | (((grub_uint64_t) low) << 10)) + + 1024 * 1024; + } + + grub_cmos_read (0x5b, &b); + grub_cmos_read (0x5c, &c); + grub_cmos_read (0x5d, &d); + above_4g = (((grub_uint64_t) b) << 16) + | (((grub_uint64_t) c) << 24) + | (((grub_uint64_t) d) << 32); +} + +grub_err_t +grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data) +{ + if (hook (0x0, + (grub_addr_t) _start, + GRUB_MEMORY_AVAILABLE, hook_data)) + return 1; + + if (hook ((grub_addr_t) _end, + 0xa0000 - (grub_addr_t) _end, + GRUB_MEMORY_AVAILABLE, hook_data)) + return 1; + + if (hook (GRUB_MEMORY_MACHINE_UPPER, + 0x100000 - GRUB_MEMORY_MACHINE_UPPER, + GRUB_MEMORY_RESERVED, hook_data)) + return 1; + + /* Everything else is free. */ + if (hook (0x100000, + min (mem_size, (grub_uint32_t) -GRUB_BOOT_MACHINE_SIZE) - 0x100000, + GRUB_MEMORY_AVAILABLE, hook_data)) + return 1; + + /* Protect boot.img, which contains the gdt. It is mapped at the top of memory + (it is also mapped below 0x100000, but we already reserved that area). */ + if (hook ((grub_uint32_t) -GRUB_BOOT_MACHINE_SIZE, + GRUB_BOOT_MACHINE_SIZE, + GRUB_MEMORY_RESERVED, hook_data)) + return 1; + + if (above_4g != 0 && hook (0x100000000ULL, above_4g, + GRUB_MEMORY_AVAILABLE, hook_data)) + return 1; + + return 0; +} diff --git a/grub-core/kern/i386/qemu/startup.S b/grub-core/kern/i386/qemu/startup.S new file mode 100644 index 0000000..0d89858 --- /dev/null +++ b/grub-core/kern/i386/qemu/startup.S @@ -0,0 +1,75 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008,2009 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 <http://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <grub/symbol.h> + +#include <grub/machine/memory.h> +#include <grub/machine/kernel.h> + + .text + .code32 + .globl _start +_start: + jmp codestart + + .org GRUB_KERNEL_I386_QEMU_CORE_ENTRY_ADDR +VARIABLE(grub_core_entry_addr) + .long 0 + +codestart: + /* Relocate to low memory. First we figure out our location. + We will derive the rom start address from it. */ + call 1f +1: popl %esi + + /* Rom size is a multiple of 64 kiB. With this we get the + value of `grub_core_entry_addr' in %esi. */ + xorw %si, %si + + movl $(_edata - _start), %ecx + movl $_start, %edi + cld + rep + movsb + ljmp $GRUB_MEMORY_MACHINE_PROT_MODE_CSEG, $1f +1: + + /* clean out the bss */ + movl $BSS_START_SYMBOL, %edi + + /* compute the bss length */ + movl $END_SYMBOL, %ecx + subl %edi, %ecx + + /* clean out */ + xorl %eax, %eax + cld + rep + stosb + + /* + * Call the start of main body of C code. + */ + call EXT_C(grub_main) + + /* This should never happen. */ + cli +1: + hlt + jmp 1b |