diff options
Diffstat (limited to 'arch/i386/boot/edd.c')
-rw-r--r-- | arch/i386/boot/edd.c | 60 |
1 files changed, 15 insertions, 45 deletions
diff --git a/arch/i386/boot/edd.c b/arch/i386/boot/edd.c index 658834d..bd138e4 100644 --- a/arch/i386/boot/edd.c +++ b/arch/i386/boot/edd.c @@ -19,57 +19,28 @@ #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) -struct edd_dapa { - u8 pkt_size; - u8 rsvd; - u16 sector_cnt; - u16 buf_off, buf_seg; - u64 lba; - u64 buf_lin_addr; -}; - /* * Read the MBR (first sector) from a specific device. */ static int read_mbr(u8 devno, void *buf) { - struct edd_dapa dapa; - u16 ax, bx, cx, dx, si; - - memset(&dapa, 0, sizeof dapa); - dapa.pkt_size = sizeof(dapa); - dapa.sector_cnt = 1; - dapa.buf_off = (size_t)buf; - dapa.buf_seg = ds(); - /* dapa.lba = 0; */ - - ax = 0x4200; /* Extended Read */ - si = (size_t)&dapa; - dx = devno; - asm("pushfl; stc; int $0x13; setc %%al; popfl" - : "+a" (ax), "+S" (si), "+d" (dx) - : "m" (dapa) - : "ebx", "ecx", "edi", "memory"); - - if (!(u8)ax) - return 0; /* OK */ + u16 ax, bx, cx, dx; ax = 0x0201; /* Legacy Read, one sector */ cx = 0x0001; /* Sector 0-0-1 */ dx = devno; bx = (size_t)buf; - asm("pushfl; stc; int $0x13; setc %%al; popfl" - : "+a" (ax), "+c" (cx), "+d" (dx), "+b" (bx) - : : "esi", "edi", "memory"); + asm volatile("pushfl; stc; int $0x13; setc %%al; popfl" + : "+a" (ax), "+c" (cx), "+d" (dx), "+b" (bx) + : : "esi", "edi", "memory"); return -(u8)ax; /* 0 or -1 */ } -static u32 read_mbr_sig(u8 devno, struct edd_info *ei) +static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig) { int sector_size; char *mbrbuf_ptr, *mbrbuf_end; - u32 mbrsig; u32 buf_base, mbr_base; extern char _end[]; @@ -85,15 +56,15 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei) /* Make sure we actually have space on the heap... */ if (!(boot_params.hdr.loadflags & CAN_USE_HEAP)) - return 0; + return -1; if (mbrbuf_end > (char *)(size_t)boot_params.hdr.heap_end_ptr) - return 0; + return -1; if (read_mbr(devno, mbrbuf_ptr)) - return 0; + return -1; - mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET]; - return mbrsig; + *mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET]; + return 0; } static int get_edd_info(u8 devno, struct edd_info *ei) @@ -160,6 +131,7 @@ void query_edd(void) int do_edd = 1; 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")) @@ -168,7 +140,8 @@ void query_edd(void) do_edd = 0; } - edp = (struct edd_info *)boot_params.eddbuf; + edp = boot_params.eddbuf; + mbrptr = boot_params.edd_mbr_sig_buffer; if (!do_edd) return; @@ -186,11 +159,8 @@ void query_edd(void) boot_params.eddbuf_entries++; } - if (do_mbr) { - u32 mbr_sig; - mbr_sig = read_mbr_sig(devno, &ei); - boot_params.edd_mbr_sig_buffer[devno-0x80] = mbr_sig; - } + if (do_mbr && !read_mbr_sig(devno, &ei, mbrptr++)) + boot_params.edd_mbr_sig_buf_entries = devno-0x80+1; } } |