diff options
Diffstat (limited to 'grub-core/kern/i386/pc')
| -rw-r--r-- | grub-core/kern/i386/pc/acpi.c | 83 | ||||
| -rw-r--r-- | grub-core/kern/i386/pc/init.c | 271 | ||||
| -rw-r--r-- | grub-core/kern/i386/pc/mmap.c | 193 | ||||
| -rw-r--r-- | grub-core/kern/i386/pc/startup.S | 217 |
4 files changed, 764 insertions, 0 deletions
diff --git a/grub-core/kern/i386/pc/acpi.c b/grub-core/kern/i386/pc/acpi.c new file mode 100644 index 0000000..297f5d0 --- /dev/null +++ b/grub-core/kern/i386/pc/acpi.c @@ -0,0 +1,83 @@ +/* acpi.c - get acpi tables. */ +/* + * 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/acpi.h> +#include <grub/misc.h> + +struct grub_acpi_rsdp_v10 * +grub_machine_acpi_get_rsdpv1 (void) +{ + int ebda_len; + grub_uint8_t *ebda, *ptr; + + grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n"); + ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4); + ebda_len = * (grub_uint16_t *) ebda; + if (! ebda_len) /* FIXME do we really need this check? */ + goto scan_bios; + for (ptr = ebda; ptr < ebda + 0x400; ptr += 16) + if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 + && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 + && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0) + return (struct grub_acpi_rsdp_v10 *) ptr; + +scan_bios: + grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n"); + for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000; + ptr += 16) + if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 + && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 + && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0) + return (struct grub_acpi_rsdp_v10 *) ptr; + return 0; +} + +struct grub_acpi_rsdp_v20 * +grub_machine_acpi_get_rsdpv2 (void) +{ + int ebda_len; + grub_uint8_t *ebda, *ptr; + + grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n"); + ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4); + ebda_len = * (grub_uint16_t *) ebda; + if (! ebda_len) /* FIXME do we really need this check? */ + goto scan_bios; + for (ptr = ebda; ptr < ebda + 0x400; ptr += 16) + if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 + && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 + && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0 + && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024 + && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length) + == 0) + return (struct grub_acpi_rsdp_v20 *) ptr; + +scan_bios: + grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n"); + for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000; + ptr += 16) + if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 + && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 + && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0 + && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024 + && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length) + == 0) + return (struct grub_acpi_rsdp_v20 *) ptr; + return 0; +} diff --git a/grub-core/kern/i386/pc/init.c b/grub-core/kern/i386/pc/init.c new file mode 100644 index 0000000..27bc68b --- /dev/null +++ b/grub-core/kern/i386/pc/init.c @@ -0,0 +1,271 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2010 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/boot.h> +#include <grub/i386/floppy.h> +#include <grub/machine/memory.h> +#include <grub/machine/console.h> +#include <grub/machine/kernel.h> +#include <grub/machine/int.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/cpu/cpuid.h> +#include <grub/cpu/tsc.h> +#include <grub/machine/time.h> + +struct mem_region +{ + grub_addr_t addr; + grub_size_t size; +}; + +#define MAX_REGIONS 32 + +static struct mem_region mem_regions[MAX_REGIONS]; +static int num_regions; + +void (*grub_pc_net_config) (char **device, char **path); + +/* + * return the real time in ticks, of which there are about + * 18-20 per second + */ +grub_uint64_t +grub_rtc_get_time_ms (void) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x1a, ®s); + + return ((regs.ecx << 16) | (regs.edx & 0xffff)) * 55ULL; +} + +void +grub_machine_get_bootlocation (char **device, char **path) +{ + char *ptr; + grub_uint8_t boot_drive, dos_part, bsd_part; + + boot_drive = (grub_boot_device >> 24); + dos_part = (grub_boot_device >> 16); + bsd_part = (grub_boot_device >> 8); + + /* No hardcoded root partition - make it from the boot drive and the + partition number encoded at the install time. */ + if (boot_drive == GRUB_BOOT_MACHINE_PXE_DL) + { + if (grub_pc_net_config) + grub_pc_net_config (device, path); + return; + } + + /* XXX: This should be enough. */ +#define DEV_SIZE 100 + *device = grub_malloc (DEV_SIZE); + ptr = *device; + grub_snprintf (*device, DEV_SIZE, + "%cd%u", (boot_drive & 0x80) ? 'h' : 'f', + boot_drive & 0x7f); + ptr += grub_strlen (ptr); + + if (dos_part != 0xff) + grub_snprintf (ptr, DEV_SIZE - (ptr - *device), + ",%u", dos_part + 1); + ptr += grub_strlen (ptr); + + if (bsd_part != 0xff) + grub_snprintf (ptr, DEV_SIZE - (ptr - *device), ",%u", + bsd_part + 1); + ptr += grub_strlen (ptr); + *ptr = 0; +} + +/* Add a memory region. */ +static void +add_mem_region (grub_addr_t addr, grub_size_t size) +{ + if (num_regions == MAX_REGIONS) + /* Ignore. */ + return; + + mem_regions[num_regions].addr = addr; + mem_regions[num_regions].size = size; + num_regions++; +} + +/* Compact memory regions. */ +static void +compact_mem_regions (void) +{ + int i, j; + + /* Sort them. */ + for (i = 0; i < num_regions - 1; i++) + for (j = i + 1; j < num_regions; j++) + if (mem_regions[i].addr > mem_regions[j].addr) + { + struct mem_region tmp = mem_regions[i]; + mem_regions[i] = mem_regions[j]; + mem_regions[j] = tmp; + } + + /* Merge overlaps. */ + for (i = 0; i < num_regions - 1; i++) + if (mem_regions[i].addr + mem_regions[i].size >= mem_regions[i + 1].addr) + { + j = i + 1; + + if (mem_regions[i].addr + mem_regions[i].size + < mem_regions[j].addr + mem_regions[j].size) + mem_regions[i].size = (mem_regions[j].addr + mem_regions[j].size + - mem_regions[i].addr); + + grub_memmove (mem_regions + j, mem_regions + j + 1, + (num_regions - j - 1) * sizeof (struct mem_region)); + i--; + num_regions--; + } +} + +grub_addr_t grub_modbase; +extern grub_uint8_t _start[], _edata[]; + +/* Helper for grub_machine_init. */ +static int +mmap_iterate_hook (grub_uint64_t addr, grub_uint64_t size, + grub_memory_type_t type, + void *data __attribute__ ((unused))) +{ + /* Avoid the lower memory. */ + if (addr < GRUB_MEMORY_MACHINE_UPPER_START) + { + if (size <= GRUB_MEMORY_MACHINE_UPPER_START - addr) + return 0; + + size -= GRUB_MEMORY_MACHINE_UPPER_START - addr; + addr = GRUB_MEMORY_MACHINE_UPPER_START; + } + + /* Ignore >4GB. */ + if (addr <= 0xFFFFFFFF && type == GRUB_MEMORY_AVAILABLE) + { + grub_size_t len; + + len = (grub_size_t) ((addr + size > 0xFFFFFFFF) + ? 0xFFFFFFFF - addr + : size); + add_mem_region (addr, len); + } + + return 0; +} + +extern grub_uint16_t grub_bios_via_workaround1, grub_bios_via_workaround2; + +/* Via needs additional wbinvd. */ +static void +grub_via_workaround_init (void) +{ + grub_uint32_t manufacturer[3], max_cpuid; + if (! grub_cpu_is_cpuid_supported ()) + return; + + grub_cpuid (0, max_cpuid, manufacturer[0], manufacturer[2], manufacturer[1]); + + if (grub_memcmp (manufacturer, "CentaurHauls", 12) != 0) + return; + + grub_bios_via_workaround1 = 0x090f; + grub_bios_via_workaround2 = 0x090f; + asm volatile ("wbinvd"); +} + +void +grub_machine_init (void) +{ + int i; +#if 0 + int grub_lower_mem; +#endif + grub_addr_t modend; + + /* This has to happen before any BIOS calls. */ + grub_via_workaround_init (); + + grub_modbase = GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR + (_edata - _start); + + /* Initialize the console as early as possible. */ + grub_console_init (); + + /* This sanity check is useless since top of GRUB_MEMORY_MACHINE_RESERVED_END + is used for stack and if it's unavailable we wouldn't have gotten so far. + */ +#if 0 + grub_lower_mem = grub_get_conv_memsize () << 10; + + /* Sanity check. */ + if (grub_lower_mem < GRUB_MEMORY_MACHINE_RESERVED_END) + grub_fatal ("too small memory"); +#endif + +/* FIXME: This prevents loader/i386/linux.c from using low memory. When our + heap implements support for requesting a chunk in low memory, this should + no longer be a problem. */ +#if 0 + /* Add the lower memory into free memory. */ + if (grub_lower_mem >= GRUB_MEMORY_MACHINE_RESERVED_END) + add_mem_region (GRUB_MEMORY_MACHINE_RESERVED_END, + grub_lower_mem - GRUB_MEMORY_MACHINE_RESERVED_END); +#endif + + grub_machine_mmap_iterate (mmap_iterate_hook, NULL); + + compact_mem_regions (); + + modend = grub_modules_get_end (); + for (i = 0; i < num_regions; i++) + { + grub_addr_t beg = mem_regions[i].addr; + grub_addr_t fin = mem_regions[i].addr + mem_regions[i].size; + if (modend && beg < modend) + beg = modend; + if (beg >= fin) + continue; + grub_mm_init_region ((void *) beg, fin - beg); + } + + grub_tsc_init (); +} + +void +grub_machine_fini (int flags) +{ + if (flags & GRUB_LOADER_FLAG_NORETURN) + grub_console_fini (); + grub_stop_floppy (); +} diff --git a/grub-core/kern/i386/pc/mmap.c b/grub-core/kern/i386/pc/mmap.c new file mode 100644 index 0000000..c0c3c35 --- /dev/null +++ b/grub-core/kern/i386/pc/mmap.c @@ -0,0 +1,193 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2003,2004,2005,2006,2007,2008 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/machine/memory.h> +#include <grub/machine/int.h> +#include <grub/err.h> +#include <grub/types.h> +#include <grub/misc.h> + +struct grub_machine_mmap_entry +{ + grub_uint32_t size; + grub_uint64_t addr; + grub_uint64_t len; +#define GRUB_MACHINE_MEMORY_AVAILABLE 1 +#define GRUB_MACHINE_MEMORY_RESERVED 2 +#define GRUB_MACHINE_MEMORY_ACPI 3 +#define GRUB_MACHINE_MEMORY_NVS 4 +#define GRUB_MACHINE_MEMORY_BADRAM 5 + grub_uint32_t type; +} GRUB_PACKED; + + +/* + * + * grub_get_conv_memsize(i) : return the conventional memory size in KB. + * BIOS call "INT 12H" to get conventional memory size + * The return value in AX. + */ +static inline grub_uint16_t +grub_get_conv_memsize (void) +{ + struct grub_bios_int_registers regs; + + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x12, ®s); + return regs.eax & 0xffff; +} + +/* + * grub_get_ext_memsize() : return the extended memory size in KB. + * BIOS call "INT 15H, AH=88H" to get extended memory size + * The return value in AX. + * + */ +static inline grub_uint16_t +grub_get_ext_memsize (void) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x8800; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x15, ®s); + return regs.eax & 0xffff; +} + +/* Get a packed EISA memory map. Lower 16 bits are between 1MB and 16MB + in 1KB parts, and upper 16 bits are above 16MB in 64KB parts. If error, return zero. + BIOS call "INT 15H, AH=E801H" to get EISA memory map, + AX = memory between 1M and 16M in 1K parts. + BX = memory above 16M in 64K parts. +*/ + +static inline grub_uint32_t +grub_get_eisa_mmap (void) +{ + struct grub_bios_int_registers regs; + + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + regs.eax = 0xe801; + grub_bios_interrupt (0x15, ®s); + + if ((regs.eax & 0xff00) == 0x8600) + return 0; + + return (regs.eax & 0xffff) | (regs.ebx << 16); +} + +/* + * + * grub_get_mmap_entry(addr, cont) : address and old continuation value (zero to + * start), for the Query System Address Map BIOS call. + * + * Sets the first 4-byte int value of "addr" to the size returned by + * the call. If the call fails, sets it to zero. + * + * Returns: new (non-zero) continuation value, 0 if done. + */ +/* Get a memory map entry. Return next continuation value. Zero means + the end. */ +static grub_uint32_t +grub_get_mmap_entry (struct grub_machine_mmap_entry *entry, + grub_uint32_t cont) +{ + struct grub_bios_int_registers regs; + + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + + /* place address (+4) in ES:DI */ + regs.es = ((grub_addr_t) &entry->addr) >> 4; + regs.edi = ((grub_addr_t) &entry->addr) & 0xf; + + /* set continuation value */ + regs.ebx = cont; + + /* set default maximum buffer size */ + regs.ecx = sizeof (*entry) - sizeof (entry->size); + + /* set EDX to 'SMAP' */ + regs.edx = 0x534d4150; + + regs.eax = 0xe820; + grub_bios_interrupt (0x15, ®s); + + /* write length of buffer (zero if error) into ADDR */ + if ((regs.flags & GRUB_CPU_INT_FLAGS_CARRY) || regs.eax != 0x534d4150 + || regs.ecx < 0x14 || regs.ecx > 0x400) + entry->size = 0; + else + entry->size = regs.ecx; + + /* return the continuation value */ + return regs.ebx; +} + +grub_err_t +grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data) +{ + grub_uint32_t cont = 0; + struct grub_machine_mmap_entry *entry + = (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR; + int e820_works = 0; + + while (1) + { + grub_memset (entry, 0, sizeof (*entry)); + + cont = grub_get_mmap_entry (entry, cont); + + if (!entry->size) + break; + + if (entry->len) + e820_works = 1; + if (entry->len + && hook (entry->addr, entry->len, + /* GRUB mmaps have been defined to match with + the E820 definition. + Therefore, we can just pass type through. */ + entry->type, hook_data)) + break; + + if (! cont) + break; + } + + if (!e820_works) + { + grub_uint32_t eisa_mmap = grub_get_eisa_mmap (); + + if (hook (0x0, ((grub_uint32_t) grub_get_conv_memsize ()) << 10, + GRUB_MEMORY_AVAILABLE, hook_data)) + return 0; + + if (eisa_mmap) + { + if (hook (0x100000, (eisa_mmap & 0xFFFF) << 10, + GRUB_MEMORY_AVAILABLE, hook_data) == 0) + hook (0x1000000, eisa_mmap & ~0xFFFF, GRUB_MEMORY_AVAILABLE, + hook_data); + } + else + hook (0x100000, ((grub_uint32_t) grub_get_ext_memsize ()) << 10, + GRUB_MEMORY_AVAILABLE, hook_data); + } + + return 0; +} diff --git a/grub-core/kern/i386/pc/startup.S b/grub-core/kern/i386/pc/startup.S new file mode 100644 index 0000000..b8a9b33 --- /dev/null +++ b/grub-core/kern/i386/pc/startup.S @@ -0,0 +1,217 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008,2009,2011 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/>. + */ + + +/* + * Note: These functions defined in this file may be called from C. + * Be careful of that you must not modify some registers. Quote + * from gcc-2.95.2/gcc/config/i386/i386.h: + + 1 for registers not available across function calls. + These must include the FIXED_REGISTERS and also any + registers that can be used without being saved. + The latter must include the registers where values are returned + and the register where structure-value addresses are passed. + Aside from that, you can include as many other registers as you like. + + ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg +{ 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 } + */ + +/* + * Note: GRUB is compiled with the options -mrtd and -mregparm=3. + * So the first three arguments are passed in %eax, %edx, and %ecx, + * respectively, and if a function has a fixed number of arguments + * and the number is greater than three, the function must return + * with "ret $N" where N is ((the number of arguments) - 3) * 4. + */ + +#include <config.h> +#include <grub/symbol.h> +#include <multiboot.h> +#ifdef __APPLE__ +#include <grub/i386/pc/memory.h> +#endif + + .file "startup.S" + + .text + + .globl start, _start, __start +start: +_start: +__start: +#ifdef __APPLE__ +LOCAL(start): +#endif + .code32 + + movl %ecx, (LOCAL(real_to_prot_addr) - _start) (%esi) + movl %edi, (LOCAL(prot_to_real_addr) - _start) (%esi) + movl %eax, (EXT_C(grub_realidt) - _start) (%esi) + + /* copy back the decompressed part (except the modules) */ +#ifdef __APPLE__ + movl $EXT_C(_edata), %ecx + subl $LOCAL(start), %ecx +#else + movl $(_edata - _start), %ecx +#endif + movl $(_start), %edi + rep + movsb + + movl $LOCAL (cont), %esi + jmp *%esi +LOCAL(cont): + +#if 0 + /* copy modules before cleaning out the bss */ + movl EXT_C(grub_total_module_size), %ecx + movl EXT_C(grub_kernel_image_size), %esi + addl %ecx, %esi + addl $_start, %esi + decl %esi + movl $END_SYMBOL, %edi + addl %ecx, %edi + decl %edi + std + rep + movsb +#endif + +#ifdef __APPLE__ + /* clean out the bss */ + movl $EXT_C(_edata), %edi + + /* compute the bss length */ + movl $GRUB_MEMORY_MACHINE_SCRATCH_ADDR, %ecx +#else + /* clean out the bss */ + movl $BSS_START_SYMBOL, %edi + + /* compute the bss length */ + movl $END_SYMBOL, %ecx +#endif + subl %edi, %ecx + + /* clean out */ + xorl %eax, %eax + cld + rep + stosb + + movl %edx, EXT_C(grub_boot_device) + + /* + * Call the start of main body of C code. + */ + call EXT_C(grub_main) + +LOCAL(real_to_prot_addr): + .long 0 +LOCAL(prot_to_real_addr): + .long 0 + + .macro PROT_TO_REAL + movl LOCAL(prot_to_real_addr), %eax + call *%eax + .endm + + .macro REAL_TO_PROT + movl LOCAL(real_to_prot_addr), %eax + calll *%eax + .endm + +/* + * grub_exit() + * + * Exit the system. + */ +FUNCTION(grub_exit) + PROT_TO_REAL + .code16 + /* Tell the BIOS a boot failure. If this does not work, reboot. */ + int $0x18 + /* set 0x472 to 0x0000 for cold boot (0x1234 for warm boot) */ + xorw %ax, %ax + movw $0x0472, %di + movw %ax, (%di) + ljmp $0xf000, $0xfff0 + .code32 + +/* + * int grub_pxe_call (int func, void* data, grub_uint32_t pxe_rm_entry); + */ +FUNCTION(grub_pxe_call) + pushl %ebp + movl %esp, %ebp + pushl %esi + pushl %edi + pushl %ebx + + movl %ecx, %ebx + movl %eax, %ecx + movl %edx, %eax + andl $0xF, %eax + shrl $4, %edx + shll $16, %edx + addl %eax, %edx + + PROT_TO_REAL + .code16 + + pushl %ebx + pushl %edx + pushw %cx + movw %sp, %bx + lcall *%ss:6(%bx) + cld + addw $10, %sp + movw %ax, %cx + + REAL_TO_PROT + .code32 + + movzwl %cx, %eax + + popl %ebx + popl %edi + popl %esi + popl %ebp + ret + +#include "../int.S" + +VARIABLE(grub_realidt) + .long 0 + +#ifdef __APPLE__ + /* Older versions of objconv assume that there is the same number + of text and data sections. Hence this dummy. */ + .section __TEXT, __zz_dummy + .byte 0 + .globl EXT_C(_edata) + .globl EXT_C(grub_boot_device) + .zerofill __DATA, __aa_before_bss, EXT_C(_edata), 1, 0 + .zerofill __DATA, __bss, EXT_C(grub_boot_device), 4, 2 +#else + .bss +VARIABLE(grub_boot_device) + .long 0 +#endif |