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Fix the DOS port

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Now the DS selector limit is set to 4GB and all mmio accesses goes
through DS, the 1:1 mapping is fixed so the _DS base is taken onto
account. Plus is that the hwaccess.c needs no change and memcpy etc can
be used on mmaped space.

Corresponding to flashrom svn r995.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz> 
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
This commit is contained in:
Rudolf Marek
2010-04-25 22:47:50 +00:00
parent ce1c798c1c
commit 837d810796
3 changed files with 34 additions and 76 deletions
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67
physmap.c
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@ -30,20 +30,45 @@
#ifdef __DJGPP__
#include <dpmi.h>
#include <sys/nearptr.h>
#define MEM_DEV "dpmi"
unsigned short segFS = 0;
static void *realmem_map;
static void *map_first_meg(unsigned long phys_addr, size_t len)
{
if (realmem_map) {
return realmem_map + phys_addr;
}
realmem_map = valloc(1024 * 1024);
if (!realmem_map) {
return NULL;
}
if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) {
return NULL;
}
return realmem_map + phys_addr;
}
void *sys_physmap(unsigned long phys_addr, size_t len)
{
int ret;
__dpmi_meminfo mi;
if (segFS == 0) {
segFS = __dpmi_allocate_ldt_descriptors (1);
__dpmi_set_segment_base_address (segFS, 0x0);
__dpmi_set_segment_limit (segFS, 0xffffffff);
/* enable 4GB limit on DS descriptor */
if (!__djgpp_nearptr_enable()) {
return NULL;
}
if ((phys_addr + len - 1) < (1024 * 1024)) {
/* we need to use another method to map first 1MB */
return map_first_meg(phys_addr, len);
}
mi.address = phys_addr;
@ -54,42 +79,18 @@ void *sys_physmap(unsigned long phys_addr, size_t len)
return NULL;
}
return (void *) mi.address;
return (void *) mi.address + __djgpp_conventional_base;
}
#define sys_physmap_rw_uncached sys_physmap
#include <sys/movedata.h>
#include <sys/segments.h>
#include <go32.h>
static void *realmem_cpy;
void *sys_physmap_ro_cached(unsigned long phys_addr, size_t len)
{
/* no support for not a 1MB of mem */
if ((phys_addr + len) > 1024*1024)
return NULL;
if (realmem_cpy)
return realmem_cpy + phys_addr;
realmem_cpy = valloc(1024*1024);
if (!realmem_cpy)
return NULL;
movedata(_dos_ds, 0, _my_ds(), (unsigned long) realmem_cpy, 1024*1024);
return realmem_cpy + phys_addr;
}
#define sys_physmap_ro_cached sys_physmap
void physunmap(void *virt_addr, size_t len)
{
__dpmi_meminfo mi;
/* we ignore unmaps for our cheat 1MB copy */
if ((virt_addr >= realmem_cpy) && ((virt_addr + len) <= (realmem_cpy + 1024*1024))) {
/* we ignore unmaps for our first 1MB */
if ((virt_addr >= realmem_map) && ((virt_addr + len) <= (realmem_map + (1024 * 1024)))) {
return;
}