diff options
Diffstat (limited to 'physmap.c')
| -rw-r--r-- | physmap.c | 73 |
1 files changed, 72 insertions, 1 deletions
@@ -4,6 +4,7 @@ * Copyright (C) 2009 Peter Stuge <peter@stuge.se> * Copyright (C) 2009 coresystems GmbH * Copyright (C) 2010 Carl-Daniel Hailfinger + * Copyright (C) 2010 Rudolf Marek <r.marek@assembler.cz> * * 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 @@ -27,7 +28,77 @@ #include <errno.h> #include "flash.h" -#ifdef __DARWIN__ +#ifdef __DJGPP__ +#include <dpmi.h> + +#define MEM_DEV "dpmi" + +unsigned short segFS = 0; + +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); + } + + mi.address = phys_addr; + mi.size = len; + ret = __dpmi_physical_address_mapping (&mi); + + if (ret != 0) { + return NULL; + } + + return (void *) mi.address; +} + +#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; +} + + +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))) { + return; + } + + mi.address = (unsigned long) virt_addr; + __dpmi_free_physical_address_mapping(&mi); +} + +#elif defined(__DARWIN__) + #include <DirectIO/darwinio.h> #define MEM_DEV "DirectIO" |
