diff options
Diffstat (limited to 'contrib/syslinux/syslinux-4.03/com32/mboot/mem.c')
| -rw-r--r-- | contrib/syslinux/syslinux-4.03/com32/mboot/mem.c | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/contrib/syslinux/syslinux-4.03/com32/mboot/mem.c b/contrib/syslinux/syslinux-4.03/com32/mboot/mem.c deleted file mode 100644 index 6a31fac..0000000 --- a/contrib/syslinux/syslinux-4.03/com32/mboot/mem.c +++ /dev/null @@ -1,205 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2007-2009 H. Peter Anvin - All Rights Reserved - * Copyright 2009 H. Peter Anvin - All Rights Reserved - * - * Permission is hereby granted, free of charge, to any person - * obtaining a copy of this software and associated documentation - * files (the "Software"), to deal in the Software without - * restriction, including without limitation the rights to use, - * copy, modify, merge, publish, distribute, sublicense, and/or - * sell copies of the Software, and to permit persons to whom - * the Software is furnished to do so, subject to the following - * conditions: - * - * The above copyright notice and this permission notice shall - * be included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES - * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT - * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, - * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR - * OTHER DEALINGS IN THE SOFTWARE. - * - * ----------------------------------------------------------------------- */ - -/* - * mem.c - * - * Obtain a memory map for a Multiboot OS - * - * This differs from the libcom32 memory map functions in that it doesn't - * attempt to filter out memory regions... - */ - -#include "mboot.h" -#include <com32.h> - -struct e820_entry { - uint64_t start; - uint64_t len; - uint32_t type; -}; - -#define RANGE_ALLOC_BLOCK 128 - -static int mboot_scan_memory(struct AddrRangeDesc **ardp, uint32_t * dosmem) -{ - com32sys_t ireg, oreg; - struct e820_entry *e820buf = __com32.cs_bounce; - struct AddrRangeDesc *ard; - size_t ard_count, ard_space; - - /* Use INT 12h to get DOS memory */ - __intcall(0x12, &__com32_zero_regs, &oreg); - *dosmem = oreg.eax.w[0] << 10; - if (*dosmem < 32 * 1024 || *dosmem > 640 * 1024) { - /* INT 12h reports nonsense... now what? */ - uint16_t ebda_seg = *(uint16_t *) 0x40e; - if (ebda_seg >= 0x8000 && ebda_seg < 0xa000) - *dosmem = ebda_seg << 4; - else - *dosmem = 640 * 1024; /* Hope for the best... */ - } - - /* Allocate initial space */ - *ardp = ard = malloc(RANGE_ALLOC_BLOCK * sizeof *ard); - if (!ard) - return 0; - - ard_count = 0; - ard_space = RANGE_ALLOC_BLOCK; - - /* First try INT 15h AX=E820h */ - memset(&ireg, 0, sizeof ireg); - ireg.eax.l = 0xe820; - ireg.edx.l = 0x534d4150; - /* ireg.ebx.l = 0; */ - ireg.ecx.l = sizeof(*e820buf); - ireg.es = SEG(e820buf); - ireg.edi.w[0] = OFFS(e820buf); - memset(e820buf, 0, sizeof *e820buf); - - do { - __intcall(0x15, &ireg, &oreg); - - if ((oreg.eflags.l & EFLAGS_CF) || - (oreg.eax.l != 0x534d4150) || (oreg.ecx.l < 20)) - break; - - if (ard_count >= ard_space) { - ard_space += RANGE_ALLOC_BLOCK; - *ardp = ard = realloc(ard, ard_space * sizeof *ard); - if (!ard) - return ard_count; - } - - ard[ard_count].size = 20; - ard[ard_count].BaseAddr = e820buf->start; - ard[ard_count].Length = e820buf->len; - ard[ard_count].Type = e820buf->type; - ard_count++; - - ireg.ebx.l = oreg.ebx.l; - } while (oreg.ebx.l); - - if (ard_count) - return ard_count; - - ard[0].size = 20; - ard[0].BaseAddr = 0; - ard[0].Length = *dosmem << 10; - ard[0].Type = 1; - - /* Next try INT 15h AX=E801h */ - ireg.eax.w[0] = 0xe801; - __intcall(0x15, &ireg, &oreg); - - if (!(oreg.eflags.l & EFLAGS_CF) && oreg.ecx.w[0]) { - ard[1].size = 20; - ard[1].BaseAddr = 1 << 20; - ard[1].Length = oreg.ecx.w[0] << 10; - ard[1].Type = 1; - - if (oreg.edx.w[0]) { - ard[2].size = 20; - ard[2].BaseAddr = 16 << 20; - ard[2].Length = oreg.edx.w[0] << 16; - ard[2].Type = 1; - return 3; - } else { - return 2; - } - } - - /* Finally try INT 15h AH=88h */ - ireg.eax.w[0] = 0x8800; - if (!(oreg.eflags.l & EFLAGS_CF) && oreg.eax.w[0]) { - ard[1].size = 20; - ard[1].BaseAddr = 1 << 20; - ard[1].Length = oreg.ecx.w[0] << 10; - ard[1].Type = 1; - return 2; - } - - return 1; /* ... problematic ... */ -} - -void mboot_make_memmap(void) -{ - int i, nmap; - struct AddrRangeDesc *ard; - uint32_t lowmem, highmem; - uint32_t highrsvd; - - /* Always report DOS memory as "lowmem", this may be overly conservative - (e.g. if we're dropping PXE), but it should be *safe*... */ - - nmap = mboot_scan_memory(&ard, &lowmem); - - highmem = 0x100000; - highrsvd = 0xfff00000; - -again: - for (i = 0; i < nmap; i++) { - uint64_t start, end; - - start = ard[i].BaseAddr; - end = start + ard[i].Length; - - if (end < start) - end = ~0ULL; - - if (start & 0xffffffff00000000ULL) - continue; /* Not interested in 64-bit memory */ - - if (start < highmem) - start = highmem; - - if (end <= start) - continue; - - if (ard[i].Type == 1 && start == highmem) { - highmem = end; - goto again; - } else if (ard[i].Type != 1 && start < highrsvd) - highrsvd = start; - } - - if (highmem > highrsvd) - highmem = highrsvd; - - mbinfo.mem_lower = lowmem >> 10; - mbinfo.mem_upper = (highmem - 0x100000) >> 10; - mbinfo.flags |= MB_INFO_MEMORY; - - /* The spec says this address should be +4, but Grub disagrees */ - mbinfo.mmap_addr = map_data(ard, nmap * sizeof *ard, 4, false); - if (mbinfo.mmap_addr) { - mbinfo.mmap_length = nmap * sizeof *ard; - mbinfo.flags |= MB_INFO_MEM_MAP; - } -} |