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Code Issues Releases Wiki Activity

Fix the documentation and DOS port

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Update the DOS cross-compile documentation,
and workaround issue with valloc() with the
latest DJGPP.

Change-Id: I909c5635aec5076440d2fde73d943f8ad10b8051
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Reviewed-on: https://review.coreboot.org/23039
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Rudolf Marek
2017-12-29 16:30:49 +01:00
committed by Nico Huber
parent 73c882086f
commit 25fde40f85
2 changed files with 53 additions and 26 deletions
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31
physmap.c
View File

@ -38,29 +38,40 @@
#ifdef __DJGPP__
#include <dpmi.h>
#include <malloc.h>
#include <sys/nearptr.h>
#define ONE_MEGABYTE (1024 * 1024)
#define MEM_DEV "dpmi"
static void *realmem_map;
static void *realmem_map_aligned;
static void *map_first_meg(uintptr_t phys_addr, size_t len)
{
if (realmem_map)
return realmem_map + phys_addr;
void *realmem_map;
size_t pagesize;
realmem_map = valloc(1024 * 1024);
if (realmem_map_aligned)
return realmem_map_aligned + phys_addr;
/* valloc() from DJGPP 2.05 does not work properly */
pagesize = getpagesize();
realmem_map = malloc(ONE_MEGABYTE + pagesize);
if (!realmem_map)
return ERROR_PTR;
if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) {
realmem_map_aligned = (void *)(((size_t) realmem_map +
(pagesize - 1)) & ~(pagesize - 1));
if (__djgpp_map_physical_memory(realmem_map_aligned, ONE_MEGABYTE, 0)) {
free(realmem_map);
realmem_map = NULL;
realmem_map_aligned = NULL;
return ERROR_PTR;
}
return realmem_map + phys_addr;
return realmem_map_aligned + phys_addr;
}
static void *sys_physmap(uintptr_t phys_addr, size_t len)
@ -72,7 +83,7 @@ static void *sys_physmap(uintptr_t phys_addr, size_t len)
if (!__djgpp_nearptr_enable())
return ERROR_PTR;
if ((phys_addr + len - 1) < (1024 * 1024)) {
if ((phys_addr + len - 1) < ONE_MEGABYTE) {
/* We need to use another method to map first 1MB. */
return map_first_meg(phys_addr, len);
}
@ -97,8 +108,8 @@ void sys_physunmap_unaligned(void *virt_addr, size_t len)
/* There is no known way to unmap the first 1 MB. The DPMI server will
* do this for us on exit.
*/
if ((virt_addr >= realmem_map) &&
((virt_addr + len) <= (realmem_map + (1024 * 1024)))) {
if ((virt_addr >= realmem_map_aligned) &&
((virt_addr + len) <= (realmem_map_aligned + ONE_MEGABYTE))) {
return;
}