diff options
Diffstat (limited to 'src/mesa/drivers/dos/dpmi.c')
| -rw-r--r-- | src/mesa/drivers/dos/dpmi.c | 148 |
1 files changed, 83 insertions, 65 deletions
diff --git a/src/mesa/drivers/dos/dpmi.c b/src/mesa/drivers/dos/dpmi.c index f9943ea60bf..81af6ac5d0b 100644 --- a/src/mesa/drivers/dos/dpmi.c +++ b/src/mesa/drivers/dos/dpmi.c @@ -23,7 +23,7 @@ */ /* - * DOS/DJGPP device driver v1.4 for Mesa + * DOS/DJGPP device driver v1.5 for Mesa * * Copyright (C) 2002 - Borca Daniel * Email : [email protected] @@ -36,100 +36,99 @@ #include "internal.h" - #ifndef MAX -#define MAX(x, y) (((x)<(y))?(y):(x)) +#define MAX(x, y) (((x) < (y)) ? (y) : (x)) #endif - /* _create_linear_mapping: * Maps a physical address range into linear memory. */ -int _create_linear_mapping (unsigned long *linear, unsigned long physaddr, int size) +int +_create_linear_mapping (unsigned long *linear, unsigned long physaddr, int size) { - __dpmi_meminfo meminfo; - - if (physaddr >= 0x100000) { - /* map into linear memory */ - meminfo.address = physaddr; - meminfo.size = size; - if (__dpmi_physical_address_mapping(&meminfo) != 0) - return -1; - - *linear = meminfo.address; - } else { - /* exploit 1 -> 1 physical to linear mapping in low megabyte */ - *linear = physaddr; - } - - return 0; + __dpmi_meminfo meminfo; + + if (physaddr >= 0x100000) { + /* map into linear memory */ + meminfo.address = physaddr; + meminfo.size = size; + if (__dpmi_physical_address_mapping(&meminfo) != 0) { + return -1; + } + + *linear = meminfo.address; + } else { + /* exploit 1 -> 1 physical to linear mapping in low megabyte */ + *linear = physaddr; + } + + return 0; } - /* _remove_linear_mapping: * Frees the DPMI resources being used to map a linear address range. */ -void _remove_linear_mapping (unsigned long *linear) +void +_remove_linear_mapping (unsigned long *linear) { - __dpmi_meminfo meminfo; + __dpmi_meminfo meminfo; - if (*linear) { - if (*linear >= 0x100000) { - meminfo.address = *linear; - __dpmi_free_physical_address_mapping(&meminfo); - } + if (*linear) { + if (*linear >= 0x100000) { + meminfo.address = *linear; + __dpmi_free_physical_address_mapping(&meminfo); + } - *linear = 0; - } + *linear = 0; + } } - /* _create_selector: * Allocates a selector to access a region of linear memory. */ -int _create_selector (int *segment, unsigned long base, int size) +int +_create_selector (int *segment, unsigned long base, int size) { - /* allocate an ldt descriptor */ - if ((*segment=__dpmi_allocate_ldt_descriptors(1)) < 0) { - *segment = 0; - return -1; - } - - /* create the linear mapping */ - if (_create_linear_mapping(&base, base, size)) { - __dpmi_free_ldt_descriptor(*segment); - *segment = 0; - return -1; - } - - /* set the descriptor base and limit */ - __dpmi_set_segment_base_address(*segment, base); - __dpmi_set_segment_limit(*segment, MAX(size-1, 0xFFFF)); - - return 0; + /* allocate an ldt descriptor */ + if ((*segment=__dpmi_allocate_ldt_descriptors(1)) < 0) { + *segment = 0; + return -1; + } + + /* create the linear mapping */ + if (_create_linear_mapping(&base, base, size)) { + __dpmi_free_ldt_descriptor(*segment); + *segment = 0; + return -1; + } + + /* set the descriptor base and limit */ + __dpmi_set_segment_base_address(*segment, base); + __dpmi_set_segment_limit(*segment, MAX(size-1, 0xFFFF)); + + return 0; } - /* _remove_selector: * Frees a DPMI segment selector. */ -void _remove_selector (int *segment) +void +_remove_selector (int *segment) { - if (*segment) { - unsigned long base; - __dpmi_get_segment_base_address(*segment, &base); - _remove_linear_mapping(&base); - __dpmi_free_ldt_descriptor(*segment); - *segment = 0; - } + if (*segment) { + unsigned long base; + __dpmi_get_segment_base_address(*segment, &base); + _remove_linear_mapping(&base); + __dpmi_free_ldt_descriptor(*segment); + *segment = 0; + } } - /* Desc: retrieve CPU MMX capability * * In : - @@ -137,12 +136,31 @@ void _remove_selector (int *segment) * * Note: - */ -int _can_mmx (void) +int +_can_mmx (void) { #ifdef USE_MMX_ASM - extern int _mesa_x86_cpu_features; - return (_mesa_x86_cpu_features & 0x00800000); + static int x86_cpu_features = 0; + __asm("\n\ + pushfl \n\ + popl %%eax \n\ + movl %%eax, %%ecx \n\ + xorl $0x200000, %%eax\n\ + pushl %%eax \n\ + popfl \n\ + pushfl \n\ + popl %%eax \n\ + pushl %%ecx \n\ + popfl \n\ + xorl %%ecx, %%eax \n\ + jz 0f \n\ + movl $1, %%eax \n\ + cpuid \n\ + movl %%edx, %0 \n\ + 0: \n\ + ":"=g"(x86_cpu_features)::"%eax", "%ebx", "%ecx", "%edx"); + return (x86_cpu_features & 0x00800000); #else - return 0; + return 0; #endif } |