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/*
* $Id$
* Copyright (C) 2007 Maciej Cencora <m.cencora@gmail.com>
* Copyright (C) 2007 Oliver McFadden <z3ro.geek@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include <revenge_detect.h>
#include <revenge_main.h>
#define round_up(x, y) (((x) + (y) - 1) & ~((y) - 1))
#define round_down(x, y) ((x) & ~((y) - 1))
void *
memory_read_agp (unsigned int addr, unsigned int size)
{
void *tmp;
if (!(tmp = (void *) malloc (size)))
{
fprintf (stderr, "%s: %s\n", program_invocation_short_name,
strerror (errno));
exit (EXIT_FAILURE);
}
memcpy (tmp, agp_mem_map + ((addr - agp_addr) >> 2), size);
return tmp;
}
static unsigned int
memory_gart_to_phys (unsigned int addr)
{
int num;
unsigned int phys_addr;
num = (addr - pcigart_start) / ATI_PCIGART_PAGE_SIZE;
assert ((pcigart_mem_map[num] & 0xc) == 0xc);
switch (option_interface)
{
case INTERFACE_IGP:
phys_addr = (pcigart_mem_map[num] & ~0xc);
break;
default:
phys_addr = (pcigart_mem_map[num] & ~0xc) << 8;
break;
}
phys_addr = phys_addr & ~(ATI_PCIGART_PAGE_SIZE - 1);
if (option_debug && option_verbose)
{
printf ("%s: addr = 0x%08x phys_addr = 0x%08x (%d)\n", __func__,
addr, phys_addr, num);
}
return phys_addr;
}
static void *
memory_read_pcigart (unsigned int addr, unsigned int size)
{
unsigned int addr_mod;
unsigned int buf_size;
unsigned int start_page_addr, end_page_addr;
void *dest;
void *mem_map, *mem_map_ptr;
void *page_mem_map;
addr_mod = addr % ATI_PCIGART_PAGE_SIZE;
buf_size = round_up (addr_mod + size, ATI_PCIGART_PAGE_SIZE);
start_page_addr = round_down (addr, ATI_PCIGART_PAGE_SIZE);
end_page_addr = start_page_addr + buf_size;
if (!(mem_map = (void *) malloc (buf_size)))
{
fprintf (stderr, "%s: %s\n", program_invocation_short_name,
strerror (errno));
exit (EXIT_FAILURE);
}
if (option_debug && option_verbose)
{
printf
("%s: addr = 0x%08x size = 0x%08x start_page_addr = 0x%08x end_page_addr = 0x%08x\n",
__func__, addr, size, start_page_addr, end_page_addr);
}
for (mem_map_ptr = mem_map; start_page_addr < end_page_addr;
start_page_addr += ATI_PCIGART_PAGE_SIZE, mem_map_ptr +=
ATI_PCIGART_PAGE_SIZE)
{
if ((page_mem_map =
mmap (NULL, ATI_PCIGART_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_SHARED, mem_fd,
memory_gart_to_phys (start_page_addr))) == MAP_FAILED)
{
fprintf (stderr, "%s: %s\n", program_invocation_short_name,
strerror (errno));
exit (EXIT_FAILURE);
}
memcpy (mem_map_ptr, page_mem_map, ATI_PCIGART_PAGE_SIZE);
if (munmap (page_mem_map, ATI_PCIGART_PAGE_SIZE) < 0)
{
fprintf (stderr, "%s: %s\n", program_invocation_short_name,
strerror (errno));
exit (EXIT_FAILURE);
}
}
if (!(dest = (void *) malloc (size)))
{
fprintf (stderr, "%s: %s\n", program_invocation_short_name,
strerror (errno));
exit (EXIT_FAILURE);
}
memcpy (dest, mem_map + addr_mod, size);
free (mem_map);
return dest;
}
void *
memory_read (unsigned int addr, unsigned int size)
{
void *mem_map;
switch (option_interface)
{
case INTERFACE_AGP:
mem_map = memory_read_agp (addr, size);
break;
default:
mem_map = memory_read_pcigart (addr, size);
break;
}
return mem_map;
}
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