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/****************************************************************************
* YABEL BIOS Emulator
*
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Copyright (c) 2008 Pattrick Hueper <phueper@hueper.net>
****************************************************************************/
/* this file contains functions provided by SLOF, that the current biosemu implementation needs
* they should go away inthe future...
*/
#include <types.h>
#include <string.h>
#include <device/device.h>
#include "../debug.h"
#include "../biosemu.h"
#define VMEM_SIZE (1024 * 1024) /* 1 MB */
#if !defined(CONFIG_YABEL_DIRECTHW) || (!CONFIG_YABEL_DIRECTHW)
#ifdef CONFIG_YABEL_VIRTMEM_LOCATION
u8* vmem = (u8 *) CONFIG_YABEL_VIRTMEM_LOCATION;
#else
u8* vmem = (u8 *) (16*1024*1024); /* default to 16MB */
#endif
#else
u8* vmem = NULL;
#endif
#if CONFIG_BOOTSPLASH
void vbe_set_graphics(void);
#endif
void run_bios(struct device * dev, unsigned long addr)
{
biosemu(vmem, VMEM_SIZE, dev, addr);
#if CONFIG_BOOTSPLASH
vbe_set_graphics();
#endif
if (vmem != NULL) {
printf("Copying legacy memory from %p to the lower 1MB\n", vmem);
memcpy((void *)0x00000, vmem + 0x00000, 0x400); // IVT
memcpy((void *)0x00400, vmem + 0x00400, 0x100); // BDA
memcpy((void *)0xc0000, vmem + 0xc0000, 0x10000); // VGA OPROM
}
}
u64 get_time(void)
{
u64 act;
u32 eax, edx;
__asm__ __volatile__(
"rdtsc"
: "=a"(eax), "=d"(edx)
: /* no inputs, no clobber */);
act = ((u64) edx << 32) | eax;
return act;
}
unsigned int
read_io(void *addr, size_t sz)
{
unsigned int ret;
/* since we are using inb instructions, we need the port number as 16bit value */
u16 port = (u16)(u32) addr;
switch (sz) {
case 1:
asm volatile ("inb %1, %b0" : "=a"(ret) : "d" (port));
break;
case 2:
asm volatile ("inw %1, %w0" : "=a"(ret) : "d" (port));
break;
case 4:
asm volatile ("inl %1, %0" : "=a"(ret) : "d" (port));
break;
default:
ret = 0;
}
return ret;
}
int
write_io(void *addr, unsigned int value, size_t sz)
{
u16 port = (u16)(u32) addr;
switch (sz) {
/* since we are using inb instructions, we need the port number as 16bit value */
case 1:
asm volatile ("outb %b0, %1" : : "a"(value), "d" (port));
break;
case 2:
asm volatile ("outw %w0, %1" : : "a"(value), "d" (port));
break;
case 4:
asm volatile ("outl %0, %1" : : "a"(value), "d" (port));
break;
default:
return -1;
}
return 0;
}
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