From 7ba92c7b986eb6b54158211ec350cd87833a79cd Mon Sep 17 00:00:00 2001 From: "kaf24@firebug.cl.cam.ac.uk" Date: Mon, 25 Jul 2005 21:01:42 +0000 Subject: [PATCH] Xen full virtualization does not handle unaligned IO with page crossing. Disable 32-bit PIO as a workaround. Signed-off-by: Asit Mallick Signed-off-by: Arun Sharma --- tools/firmware/rombios/rombios.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/tools/firmware/rombios/rombios.c b/tools/firmware/rombios/rombios.c index 4ec5d383ff..ddf5aa7ded 100644 --- a/tools/firmware/rombios/rombios.c +++ b/tools/firmware/rombios/rombios.c @@ -29,6 +29,11 @@ #define VMXASSIST #undef VMXTEST +// Xen full virtualization does not handle unaligned IO with page crossing. +// Disable 32-bit PIO as a workaround. +#define NO_PIO32 + + // ROM BIOS compatability entry points: // =================================== // $e05b ; POST Entry Point @@ -2248,6 +2253,9 @@ void ata_detect( ) Bit16u cylinders, heads, spt, blksize; Bit8u translation, removable, mode; + // default mode to PIO16 + mode = ATA_MODE_PIO16; + //Temporary values to do the transfer write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_HD); write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, ATA_MODE_PIO16); @@ -2256,7 +2264,10 @@ void ata_detect( ) BX_PANIC("ata-detect: Failed to detect ATA device\n"); removable = (read_byte(get_SS(),buffer+0) & 0x80) ? 1 : 0; +#ifndef NO_PIO32 mode = read_byte(get_SS(),buffer+96) ? ATA_MODE_PIO32 : ATA_MODE_PIO16; +#endif + blksize = read_word(get_SS(),buffer+10); cylinders = read_word(get_SS(),buffer+(1*2)); // word 1 @@ -2346,6 +2357,9 @@ void ata_detect( ) Bit8u type, removable, mode; Bit16u blksize; + // default mode to PIO16 + mode = ATA_MODE_PIO16; + //Temporary values to do the transfer write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_CDROM); write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, ATA_MODE_PIO16); @@ -2355,7 +2369,9 @@ void ata_detect( ) type = read_byte(get_SS(),buffer+1) & 0x1f; removable = (read_byte(get_SS(),buffer+0) & 0x80) ? 1 : 0; +#ifndef NO_PIO32 mode = read_byte(get_SS(),buffer+96) ? ATA_MODE_PIO32 : ATA_MODE_PIO16; +#endif blksize = 2048; write_byte(ebda_seg,&EbdaData->ata.devices[device].device, type); -- 2.30.2