mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-26 22:52:18 +00:00
4c2e3da82d
"All Rights Reserved" conflicts with the GPL. Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
372 lines
12 KiB
C
372 lines
12 KiB
C
/****************************************************************************
|
|
*
|
|
* BIOS emulator and interface
|
|
* to Realmode X86 Emulator Library
|
|
*
|
|
* Copyright (C) 2007 Freescale Semiconductor, Inc.
|
|
* Jason Jin <Jason.jin@freescale.com>
|
|
*
|
|
* Copyright (C) 1996-1999 SciTech Software, Inc.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and
|
|
* its documentation for any purpose is hereby granted without fee,
|
|
* provided that the above copyright notice appear in all copies and that
|
|
* both that copyright notice and this permission notice appear in
|
|
* supporting documentation, and that the name of the authors not be used
|
|
* in advertising or publicity pertaining to distribution of the software
|
|
* without specific, written prior permission. The authors makes no
|
|
* representations about the suitability of this software for any purpose.
|
|
* It is provided "as is" without express or implied warranty.
|
|
*
|
|
* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
|
|
* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
|
|
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
|
|
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Language: ANSI C
|
|
* Environment: Any
|
|
* Developer: Kendall Bennett
|
|
*
|
|
* Description: Module implementing the system specific functions. This
|
|
* module is always compiled and linked in the OS depedent
|
|
* libraries, and never in a binary portable driver.
|
|
*
|
|
* Jason ported this file to u-boot to run the ATI video card BIOS
|
|
* in u-boot. Made all the video memory be emulated during the
|
|
* BIOS runing process which may affect the VGA function but the
|
|
* frambuffer function can work after run the BIOS.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include <malloc.h>
|
|
#include <common.h>
|
|
#include "biosemui.h"
|
|
|
|
BE_sysEnv _BE_env = {{0}};
|
|
static X86EMU_memFuncs _BE_mem __attribute__((section(GOT2_TYPE))) = {
|
|
BE_rdb,
|
|
BE_rdw,
|
|
BE_rdl,
|
|
BE_wrb,
|
|
BE_wrw,
|
|
BE_wrl,
|
|
};
|
|
|
|
static X86EMU_pioFuncs _BE_pio __attribute__((section(GOT2_TYPE))) = {
|
|
BE_inb,
|
|
BE_inw,
|
|
BE_inl,
|
|
BE_outb,
|
|
BE_outw,
|
|
BE_outl,
|
|
};
|
|
|
|
#define OFF(addr) (u16)(((addr) >> 0) & 0xffff)
|
|
#define SEG(addr) (u16)(((addr) >> 4) & 0xf000)
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
debugFlags - Flags to enable debugging options (debug builds only)
|
|
memSize - Amount of memory to allocate for real mode machine
|
|
info - Pointer to default VGA device information
|
|
|
|
REMARKS:
|
|
This functions initialises the BElib, and uses the passed in
|
|
BIOS image as the BIOS that is used and emulated at 0xC0000.
|
|
****************************************************************************/
|
|
int X86API BE_init(u32 debugFlags, int memSize, BE_VGAInfo * info, int shared)
|
|
{
|
|
#if !defined(__DRIVER__) && !defined(__KERNEL__)
|
|
|
|
PM_init();
|
|
#endif
|
|
memset(&M, 0, sizeof(M));
|
|
if (memSize < 20480){
|
|
printf("Emulator requires at least 20Kb of memory!\n");
|
|
return 0;
|
|
}
|
|
|
|
M.mem_base = malloc(memSize);
|
|
|
|
if (M.mem_base == NULL){
|
|
printf("Biosemu:Out of memory!");
|
|
return 0;
|
|
}
|
|
M.mem_size = memSize;
|
|
|
|
_BE_env.emulateVGA = 0;
|
|
_BE_env.busmem_base = (unsigned long)malloc(128 * 1024);
|
|
if ((void *)_BE_env.busmem_base == NULL){
|
|
printf("Biosemu:Out of memory!");
|
|
return 0;
|
|
}
|
|
M.x86.debug = debugFlags;
|
|
_BE_bios_init((u32*)info->LowMem);
|
|
X86EMU_setupMemFuncs(&_BE_mem);
|
|
X86EMU_setupPioFuncs(&_BE_pio);
|
|
BE_setVGA(info);
|
|
return 1;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
info - Pointer to VGA device information to make current
|
|
|
|
REMARKS:
|
|
This function sets the VGA BIOS functions in the emulator to point to the
|
|
specific VGA BIOS in use. This includes swapping the BIOS interrupt
|
|
vectors, BIOS image and BIOS data area to the new BIOS. This allows the
|
|
real mode BIOS to be swapped without resetting the entire emulator.
|
|
****************************************************************************/
|
|
void X86API BE_setVGA(BE_VGAInfo * info)
|
|
{
|
|
|
|
#ifdef __KERNEL__
|
|
_BE_env.vgaInfo.function = info->function;
|
|
_BE_env.vgaInfo.device = info->device;
|
|
_BE_env.vgaInfo.bus = info->bus;
|
|
_BE_env.vgaInfo.pcidev = info->pcidev;
|
|
#else
|
|
_BE_env.vgaInfo.pciInfo = info->pciInfo;
|
|
#endif
|
|
_BE_env.vgaInfo.BIOSImage = info->BIOSImage;
|
|
if (info->BIOSImage) {
|
|
_BE_env.biosmem_base = (ulong) info->BIOSImage;
|
|
_BE_env.biosmem_limit = 0xC0000 + info->BIOSImageLen - 1;
|
|
} else {
|
|
_BE_env.biosmem_base = _BE_env.busmem_base + 0x20000;
|
|
_BE_env.biosmem_limit = 0xC7FFF;
|
|
}
|
|
if ((info->LowMem[0] == 0) && (info->LowMem[1] == 0) &&
|
|
(info->LowMem[2] == 0) && (info->LowMem[3] == 0))
|
|
_BE_bios_init((u32 *) info->LowMem);
|
|
memcpy((u8 *) M.mem_base, info->LowMem, sizeof(info->LowMem));
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
info - Pointer to VGA device information to retrieve current
|
|
|
|
REMARKS:
|
|
This function returns the VGA BIOS functions currently active in the
|
|
emulator, so they can be restored at a later date.
|
|
****************************************************************************/
|
|
void X86API BE_getVGA(BE_VGAInfo * info)
|
|
{
|
|
#ifdef __KERNEL__
|
|
info->function = _BE_env.vgaInfo.function;
|
|
info->device = _BE_env.vgaInfo.device;
|
|
info->bus = _BE_env.vgaInfo.bus;
|
|
info->pcidev = _BE_env.vgaInfo.pcidev;
|
|
#else
|
|
info->pciInfo = _BE_env.vgaInfo.pciInfo;
|
|
#endif
|
|
info->BIOSImage = _BE_env.vgaInfo.BIOSImage;
|
|
memcpy(info->LowMem, (u8 *) M.mem_base, sizeof(info->LowMem));
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
r_seg - Segment for pointer to convert
|
|
r_off - Offset for pointer to convert
|
|
|
|
REMARKS:
|
|
This function maps a real mode pointer in the emulator memory to a protected
|
|
mode pointer that can be used to directly access the memory.
|
|
|
|
NOTE: The memory is *always* in little endian format, son on non-x86
|
|
systems you will need to do endian translations to access this
|
|
memory.
|
|
****************************************************************************/
|
|
void *X86API BE_mapRealPointer(uint r_seg, uint r_off)
|
|
{
|
|
u32 addr = ((u32) r_seg << 4) + r_off;
|
|
|
|
if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
|
|
return (void *)(_BE_env.biosmem_base + addr - 0xC0000);
|
|
} else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
|
|
return (void *)(_BE_env.busmem_base + addr - 0xA0000);
|
|
}
|
|
return (void *)(M.mem_base + addr);
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
len - Return the length of the VESA buffer
|
|
rseg - Place to store VESA buffer segment
|
|
roff - Place to store VESA buffer offset
|
|
|
|
REMARKS:
|
|
This function returns the address of the VESA transfer buffer in real
|
|
_BE_piomode emulator memory. The VESA transfer buffer is always 1024 bytes long,
|
|
and located at 15Kb into the start of the real mode memory (16Kb is where
|
|
we put the real mode code we execute for issuing interrupts).
|
|
|
|
NOTE: The memory is *always* in little endian format, son on non-x86
|
|
systems you will need to do endian translations to access this
|
|
memory.
|
|
****************************************************************************/
|
|
void *X86API BE_getVESABuf(uint * len, uint * rseg, uint * roff)
|
|
{
|
|
*len = 1024;
|
|
*rseg = SEG(0x03C00);
|
|
*roff = OFF(0x03C00);
|
|
return (void *)(M.mem_base + ((u32) * rseg << 4) + *roff);
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Cleans up and exits the emulator.
|
|
****************************************************************************/
|
|
void X86API BE_exit(void)
|
|
{
|
|
free(M.mem_base);
|
|
free((void *)_BE_env.busmem_base);
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
seg - Segment of code to call
|
|
off - Offset of code to call
|
|
regs - Real mode registers to load
|
|
sregs - Real mode segment registers to load
|
|
|
|
REMARKS:
|
|
This functions calls a real mode far function at the specified address,
|
|
and loads all the x86 registers from the passed in registers structure.
|
|
On exit the registers returned from the call are returned in the same
|
|
structures.
|
|
****************************************************************************/
|
|
void X86API BE_callRealMode(uint seg, uint off, RMREGS * regs, RMSREGS * sregs)
|
|
{
|
|
M.x86.R_EAX = regs->e.eax;
|
|
M.x86.R_EBX = regs->e.ebx;
|
|
M.x86.R_ECX = regs->e.ecx;
|
|
M.x86.R_EDX = regs->e.edx;
|
|
M.x86.R_ESI = regs->e.esi;
|
|
M.x86.R_EDI = regs->e.edi;
|
|
M.x86.R_DS = sregs->ds;
|
|
M.x86.R_ES = sregs->es;
|
|
M.x86.R_FS = sregs->fs;
|
|
M.x86.R_GS = sregs->gs;
|
|
|
|
((u8 *) M.mem_base)[0x4000] = 0x9A;
|
|
((u8 *) M.mem_base)[0x4001] = (u8) off;
|
|
((u8 *) M.mem_base)[0x4002] = (u8) (off >> 8);
|
|
((u8 *) M.mem_base)[0x4003] = (u8) seg;
|
|
((u8 *) M.mem_base)[0x4004] = (u8) (seg >> 8);
|
|
((u8 *) M.mem_base)[0x4005] = 0xF1; /* Illegal op-code */
|
|
M.x86.R_CS = SEG(0x04000);
|
|
M.x86.R_IP = OFF(0x04000);
|
|
|
|
M.x86.R_SS = SEG(M.mem_size - 2);
|
|
M.x86.R_SP = OFF(M.mem_size - 2) + 2;
|
|
|
|
X86EMU_exec();
|
|
|
|
regs->e.cflag = M.x86.R_EFLG & F_CF;
|
|
regs->e.eax = M.x86.R_EAX;
|
|
regs->e.ebx = M.x86.R_EBX;
|
|
regs->e.ecx = M.x86.R_ECX;
|
|
regs->e.edx = M.x86.R_EDX;
|
|
regs->e.esi = M.x86.R_ESI;
|
|
regs->e.edi = M.x86.R_EDI;
|
|
sregs->ds = M.x86.R_DS;
|
|
sregs->es = M.x86.R_ES;
|
|
sregs->fs = M.x86.R_FS;
|
|
sregs->gs = M.x86.R_GS;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
intno - Interrupt number to execute
|
|
in - Real mode registers to load
|
|
out - Place to store resulting real mode registers
|
|
|
|
REMARKS:
|
|
This functions calls a real mode interrupt function at the specified address,
|
|
and loads all the x86 registers from the passed in registers structure.
|
|
On exit the registers returned from the call are returned in out stucture.
|
|
****************************************************************************/
|
|
int X86API BE_int86(int intno, RMREGS * in, RMREGS * out)
|
|
{
|
|
M.x86.R_EAX = in->e.eax;
|
|
M.x86.R_EBX = in->e.ebx;
|
|
M.x86.R_ECX = in->e.ecx;
|
|
M.x86.R_EDX = in->e.edx;
|
|
M.x86.R_ESI = in->e.esi;
|
|
M.x86.R_EDI = in->e.edi;
|
|
((u8 *) M.mem_base)[0x4000] = 0xCD;
|
|
((u8 *) M.mem_base)[0x4001] = (u8) intno;
|
|
((u8 *) M.mem_base)[0x4002] = 0xF1;
|
|
M.x86.R_CS = SEG(0x04000);
|
|
M.x86.R_IP = OFF(0x04000);
|
|
|
|
M.x86.R_SS = SEG(M.mem_size - 1);
|
|
M.x86.R_SP = OFF(M.mem_size - 1) - 1;
|
|
|
|
X86EMU_exec();
|
|
out->e.cflag = M.x86.R_EFLG & F_CF;
|
|
out->e.eax = M.x86.R_EAX;
|
|
out->e.ebx = M.x86.R_EBX;
|
|
out->e.ecx = M.x86.R_ECX;
|
|
out->e.edx = M.x86.R_EDX;
|
|
out->e.esi = M.x86.R_ESI;
|
|
out->e.edi = M.x86.R_EDI;
|
|
return out->x.ax;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
intno - Interrupt number to execute
|
|
in - Real mode registers to load
|
|
out - Place to store resulting real mode registers
|
|
sregs - Real mode segment registers to load
|
|
|
|
REMARKS:
|
|
This functions calls a real mode interrupt function at the specified address,
|
|
and loads all the x86 registers from the passed in registers structure.
|
|
On exit the registers returned from the call are returned in out stucture.
|
|
****************************************************************************/
|
|
int X86API BE_int86x(int intno, RMREGS * in, RMREGS * out, RMSREGS * sregs)
|
|
{
|
|
M.x86.R_EAX = in->e.eax;
|
|
M.x86.R_EBX = in->e.ebx;
|
|
M.x86.R_ECX = in->e.ecx;
|
|
M.x86.R_EDX = in->e.edx;
|
|
M.x86.R_ESI = in->e.esi;
|
|
M.x86.R_EDI = in->e.edi;
|
|
M.x86.R_DS = sregs->ds;
|
|
M.x86.R_ES = sregs->es;
|
|
M.x86.R_FS = sregs->fs;
|
|
M.x86.R_GS = sregs->gs;
|
|
((u8 *) M.mem_base)[0x4000] = 0xCD;
|
|
((u8 *) M.mem_base)[0x4001] = (u8) intno;
|
|
((u8 *) M.mem_base)[0x4002] = 0xF1;
|
|
M.x86.R_CS = SEG(0x04000);
|
|
M.x86.R_IP = OFF(0x04000);
|
|
|
|
M.x86.R_SS = SEG(M.mem_size - 1);
|
|
M.x86.R_SP = OFF(M.mem_size - 1) - 1;
|
|
|
|
X86EMU_exec();
|
|
out->e.cflag = M.x86.R_EFLG & F_CF;
|
|
out->e.eax = M.x86.R_EAX;
|
|
out->e.ebx = M.x86.R_EBX;
|
|
out->e.ecx = M.x86.R_ECX;
|
|
out->e.edx = M.x86.R_EDX;
|
|
out->e.esi = M.x86.R_ESI;
|
|
out->e.edi = M.x86.R_EDI;
|
|
sregs->ds = M.x86.R_DS;
|
|
sregs->es = M.x86.R_ES;
|
|
sregs->fs = M.x86.R_FS;
|
|
sregs->gs = M.x86.R_GS;
|
|
return out->x.ax;
|
|
}
|