diff options
Diffstat (limited to 'contrib/syslinux/latest/com32/lib/syslinux/memscan.c')
| -rw-r--r-- | contrib/syslinux/latest/com32/lib/syslinux/memscan.c | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/contrib/syslinux/latest/com32/lib/syslinux/memscan.c b/contrib/syslinux/latest/com32/lib/syslinux/memscan.c deleted file mode 100644 index fc676cb..0000000 --- a/contrib/syslinux/latest/com32/lib/syslinux/memscan.c +++ /dev/null @@ -1,158 +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. - * - * ----------------------------------------------------------------------- */ - -/* - * memscan.c - * - * Query the system for free memory - */ - -#include <assert.h> -#include <stdbool.h> -#include <stdlib.h> -#include <string.h> -#include <inttypes.h> -#include <com32.h> - -#include <syslinux/memscan.h> - -struct e820_entry { - uint64_t start; - uint64_t len; - uint32_t type; -}; - -int syslinux_scan_memory(scan_memory_callback_t callback, void *data) -{ - static com32sys_t ireg; - com32sys_t oreg; - struct e820_entry *e820buf; - uint64_t start, len, maxlen; - int memfound = 0; - int rv; - addr_t dosmem; - const addr_t bios_data = 0x510; /* Amount to reserve for BIOS data */ - - /* 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... */ - } - rv = callback(data, bios_data, dosmem - bios_data, true); - if (rv) - return rv; - - /* First try INT 15h AX=E820h */ - e820buf = lzalloc(sizeof *e820buf); - if (!e820buf) - return -1; - - 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); - - do { - __intcall(0x15, &ireg, &oreg); - - if ((oreg.eflags.l & EFLAGS_CF) || - (oreg.eax.l != 0x534d4150) || (oreg.ecx.l < 20)) - break; - - start = e820buf->start; - len = e820buf->len; - - if (start < 0x100000000ULL) { - /* Don't rely on E820 being valid for low memory. Doing so - could mean stuff like overwriting the PXE stack even when - using "keeppxe", etc. */ - if (start < 0x100000ULL) { - if (len > 0x100000ULL - start) - len -= 0x100000ULL - start; - else - len = 0; - start = 0x100000ULL; - } - - maxlen = 0x100000000ULL - start; - if (len > maxlen) - len = maxlen; - - if (len) { - rv = callback(data, (addr_t) start, (addr_t) len, - e820buf->type == 1); - if (rv) - return rv; - memfound = 1; - } - } - - ireg.ebx.l = oreg.ebx.l; - } while (oreg.ebx.l); - - lfree(e820buf); - - if (memfound) - return 0; - - /* 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]) { - rv = callback(data, (addr_t) 1 << 20, oreg.ecx.w[0] << 10, true); - if (rv) - return rv; - - if (oreg.edx.w[0]) { - rv = callback(data, (addr_t) 16 << 20, oreg.edx.w[0] << 16, true); - if (rv) - return rv; - } - - return 0; - } - - /* Finally try INT 15h AH=88h */ - ireg.eax.w[0] = 0x8800; - if (!(oreg.eflags.l & EFLAGS_CF) && oreg.eax.w[0]) { - rv = callback(data, (addr_t) 1 << 20, oreg.ecx.w[0] << 10, true); - if (rv) - return rv; - } - - return 0; -} |