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vga: simplify vga window mmio access functions 

Make use of the memory API's ability to satisfy multi-byte accesses via
multiple single-byte accesses.

We have to keep vga_mem_{read,write}b() since they're used by cirrus.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2011-08-08 16:09:01 +03:00 committed by Anthony Liguori
parent a815b16649
commit b2a5e761c6
3 changed files with 12 additions and 52 deletions
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4
hw/cirrus_vga.c
View File

@ -1966,7 +1966,7 @@ static uint64_t cirrus_vga_mem_read(void *opaque,
uint32_t val;
if ((s->vga.sr[0x07] & 0x01) == 0) {
return vga_mem_readb(s, addr);
return vga_mem_readb(&s->vga, addr);
}
if (addr < 0x10000) {
@ -2011,7 +2011,7 @@ static void cirrus_vga_mem_write(void *opaque,
unsigned mode;
if ((s->vga.sr[0x07] & 0x01) == 0) {
vga_mem_writeb(s, addr, mem_value);
vga_mem_writeb(&s->vga, addr, mem_value);
return;
}

56
hw/vga.c
View File

@ -708,9 +708,8 @@ static void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
#endif
/* called for accesses between 0xa0000 and 0xc0000 */
uint32_t vga_mem_readb(void *opaque, target_phys_addr_t addr)
uint32_t vga_mem_readb(VGACommonState *s, target_phys_addr_t addr)
{
VGACommonState *s = opaque;
int memory_map_mode, plane;
uint32_t ret;
@ -764,28 +763,9 @@ uint32_t vga_mem_readb(void *opaque, target_phys_addr_t addr)
return ret;
}
static uint32_t vga_mem_readw(void *opaque, target_phys_addr_t addr)
{
uint32_t v;
v = vga_mem_readb(opaque, addr);
v |= vga_mem_readb(opaque, addr + 1) << 8;
return v;
}
static uint32_t vga_mem_readl(void *opaque, target_phys_addr_t addr)
{
uint32_t v;
v = vga_mem_readb(opaque, addr);
v |= vga_mem_readb(opaque, addr + 1) << 8;
v |= vga_mem_readb(opaque, addr + 2) << 16;
v |= vga_mem_readb(opaque, addr + 3) << 24;
return v;
}
/* called for accesses between 0xa0000 and 0xc0000 */
void vga_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
void vga_mem_writeb(VGACommonState *s, target_phys_addr_t addr, uint32_t val)
{
VGACommonState *s = opaque;
int memory_map_mode, plane, write_mode, b, func_select, mask;
uint32_t write_mask, bit_mask, set_mask;
@ -917,20 +897,6 @@ void vga_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
}
}
static void vga_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
{
vga_mem_writeb(opaque, addr, val & 0xff);
vga_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
}
static void vga_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
vga_mem_writeb(opaque, addr, val & 0xff);
vga_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
vga_mem_writeb(opaque, addr + 2, (val >> 16) & 0xff);
vga_mem_writeb(opaque, addr + 3, (val >> 24) & 0xff);
}
typedef void vga_draw_glyph8_func(uint8_t *d, int linesize,
const uint8_t *font_ptr, int h,
uint32_t fgcol, uint32_t bgcol);
@ -2105,12 +2071,7 @@ static uint64_t vga_mem_read(void *opaque, target_phys_addr_t addr,
{
VGACommonState *s = opaque;
switch (size) {
case 1: return vga_mem_readb(s, addr);
case 2: return vga_mem_readw(s, addr);
case 4: return vga_mem_readl(s, addr);
default: abort();
}
return vga_mem_readb(s, addr);
}
static void vga_mem_write(void *opaque, target_phys_addr_t addr,
@ -2118,18 +2079,17 @@ static void vga_mem_write(void *opaque, target_phys_addr_t addr,
{
VGACommonState *s = opaque;
switch (size) {
case 1: return vga_mem_writeb(s, addr, data);
case 2: return vga_mem_writew(s, addr, data);
case 4: return vga_mem_writel(s, addr, data);
default: abort();
}
return vga_mem_writeb(s, addr, data);
}
const MemoryRegionOps vga_mem_ops = {
.read = vga_mem_read,
.write = vga_mem_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
};
static int vga_common_post_load(void *opaque, int version_id)

4
hw/vga_int.h
View File

@ -198,8 +198,8 @@ void vga_dirty_log_restart(VGACommonState *s);
extern const VMStateDescription vmstate_vga_common;
uint32_t vga_ioport_read(void *opaque, uint32_t addr);
void vga_ioport_write(void *opaque, uint32_t addr, uint32_t val);
uint32_t vga_mem_readb(void *opaque, target_phys_addr_t addr);
void vga_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val);
uint32_t vga_mem_readb(VGACommonState *s, target_phys_addr_t addr);
void vga_mem_writeb(VGACommonState *s, target_phys_addr_t addr, uint32_t val);
void vga_invalidate_scanlines(VGACommonState *s, int y1, int y2);
int ppm_save(const char *filename, struct DisplaySurface *ds);