diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/boot/edd.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/boot/edd.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/ANDROID_3.4.5/arch/x86/boot/edd.c b/ANDROID_3.4.5/arch/x86/boot/edd.c deleted file mode 100644 index c501a5b4..00000000 --- a/ANDROID_3.4.5/arch/x86/boot/edd.c +++ /dev/null @@ -1,181 +0,0 @@ -/* -*- linux-c -*- ------------------------------------------------------- * - * - * Copyright (C) 1991, 1992 Linus Torvalds - * Copyright 2007 rPath, Inc. - All Rights Reserved - * Copyright 2009 Intel Corporation; author H. Peter Anvin - * - * This file is part of the Linux kernel, and is made available under - * the terms of the GNU General Public License version 2. - * - * ----------------------------------------------------------------------- */ - -/* - * Get EDD BIOS disk information - */ - -#include "boot.h" -#include <linux/edd.h> - -#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) - -/* - * Read the MBR (first sector) from a specific device. - */ -static int read_mbr(u8 devno, void *buf) -{ - struct biosregs ireg, oreg; - - initregs(&ireg); - ireg.ax = 0x0201; /* Legacy Read, one sector */ - ireg.cx = 0x0001; /* Sector 0-0-1 */ - ireg.dl = devno; - ireg.bx = (size_t)buf; - - intcall(0x13, &ireg, &oreg); - - return -(oreg.eflags & X86_EFLAGS_CF); /* 0 or -1 */ -} - -static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig) -{ - int sector_size; - char *mbrbuf_ptr, *mbrbuf_end; - u32 buf_base, mbr_base; - extern char _end[]; - u16 mbr_magic; - - sector_size = ei->params.bytes_per_sector; - if (!sector_size) - sector_size = 512; /* Best available guess */ - - /* Produce a naturally aligned buffer on the heap */ - buf_base = (ds() << 4) + (u32)&_end; - mbr_base = (buf_base+sector_size-1) & ~(sector_size-1); - mbrbuf_ptr = _end + (mbr_base-buf_base); - mbrbuf_end = mbrbuf_ptr + sector_size; - - /* Make sure we actually have space on the heap... */ - if (!(boot_params.hdr.loadflags & CAN_USE_HEAP)) - return -1; - if (mbrbuf_end > (char *)(size_t)boot_params.hdr.heap_end_ptr) - return -1; - - memset(mbrbuf_ptr, 0, sector_size); - if (read_mbr(devno, mbrbuf_ptr)) - return -1; - - *mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET]; - mbr_magic = *(u16 *)&mbrbuf_ptr[510]; - - /* check for valid MBR magic */ - return mbr_magic == 0xAA55 ? 0 : -1; -} - -static int get_edd_info(u8 devno, struct edd_info *ei) -{ - struct biosregs ireg, oreg; - - memset(ei, 0, sizeof *ei); - - /* Check Extensions Present */ - - initregs(&ireg); - ireg.ah = 0x41; - ireg.bx = EDDMAGIC1; - ireg.dl = devno; - intcall(0x13, &ireg, &oreg); - - if (oreg.eflags & X86_EFLAGS_CF) - return -1; /* No extended information */ - - if (oreg.bx != EDDMAGIC2) - return -1; - - ei->device = devno; - ei->version = oreg.ah; /* EDD version number */ - ei->interface_support = oreg.cx; /* EDD functionality subsets */ - - /* Extended Get Device Parameters */ - - ei->params.length = sizeof(ei->params); - ireg.ah = 0x48; - ireg.si = (size_t)&ei->params; - intcall(0x13, &ireg, &oreg); - - /* Get legacy CHS parameters */ - - /* Ralf Brown recommends setting ES:DI to 0:0 */ - ireg.ah = 0x08; - ireg.es = 0; - intcall(0x13, &ireg, &oreg); - - if (!(oreg.eflags & X86_EFLAGS_CF)) { - ei->legacy_max_cylinder = oreg.ch + ((oreg.cl & 0xc0) << 2); - ei->legacy_max_head = oreg.dh; - ei->legacy_sectors_per_track = oreg.cl & 0x3f; - } - - return 0; -} - -void query_edd(void) -{ - char eddarg[8]; - int do_mbr = 1; -#ifdef CONFIG_EDD_OFF - int do_edd = 0; -#else - int do_edd = 1; -#endif - int be_quiet; - int devno; - struct edd_info ei, *edp; - u32 *mbrptr; - - if (cmdline_find_option("edd", eddarg, sizeof eddarg) > 0) { - if (!strcmp(eddarg, "skipmbr") || !strcmp(eddarg, "skip")) { - do_edd = 1; - do_mbr = 0; - } - else if (!strcmp(eddarg, "off")) - do_edd = 0; - else if (!strcmp(eddarg, "on")) - do_edd = 1; - } - - be_quiet = cmdline_find_option_bool("quiet"); - - edp = boot_params.eddbuf; - mbrptr = boot_params.edd_mbr_sig_buffer; - - if (!do_edd) - return; - - /* Bugs in OnBoard or AddOnCards Bios may hang the EDD probe, - * so give a hint if this happens. - */ - - if (!be_quiet) - printf("Probing EDD (edd=off to disable)... "); - - for (devno = 0x80; devno < 0x80+EDD_MBR_SIG_MAX; devno++) { - /* - * Scan the BIOS-supported hard disks and query EDD - * information... - */ - if (!get_edd_info(devno, &ei) - && boot_params.eddbuf_entries < EDDMAXNR) { - memcpy(edp, &ei, sizeof ei); - edp++; - boot_params.eddbuf_entries++; - } - - if (do_mbr && !read_mbr_sig(devno, &ei, mbrptr++)) - boot_params.edd_mbr_sig_buf_entries = devno-0x80+1; - } - - if (!be_quiet) - printf("ok\n"); -} - -#endif |