[RFC v2 18/20] cirrus: simplify vga window mmio access functions

Avi Kivity
2011-06-27T13:22:15Z

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

Signed-off-by: Avi Kivity <avi@redhat.com>
---
hw/cirrus_vga.c | 83 ++++++++----------------------------------------------
1 files changed, 13 insertions(+), 70 deletions(-)

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 6312c6e..6e9e83d 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -1955,9 +1955,11 @@ static void cirrus_mem_writeb_mode4and5_16bpp(CirrusVGAState * s,
*
***************************************/

-static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
+static uint64_t cirrus_vga_mem_read(MemoryRegion *mr,
+ target_phys_addr_t addr,
+ uint32_t size)
{
- CirrusVGAState *s = opaque;
+ CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
unsigned bank_index;
unsigned bank_offset;
uint32_t val;
@@ -1966,8 +1968,6 @@ static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
return vga_mem_readb(s, addr);
}

- addr &= 0x1ffff;
-
if (addr < 0x10000) {
/* XXX handle bitblt */
/* video memory */
@@ -1999,30 +1999,12 @@ static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
return val;
}

-static uint32_t cirrus_vga_mem_readw(void *opaque, target_phys_addr_t addr)
+static void cirrus_vga_mem_write(MemoryRegion *mr,
+ target_phys_addr_t addr,
+ uint64_t mem_value,
+ uint32_t size)
{
- uint32_t v;
-
- v = cirrus_vga_mem_readb(opaque, addr);
- v |= cirrus_vga_mem_readb(opaque, addr + 1) << 8;
- return v;
-}
-
-static uint32_t cirrus_vga_mem_readl(void *opaque, target_phys_addr_t addr)
-{
- uint32_t v;
-
- v = cirrus_vga_mem_readb(opaque, addr);
- v |= cirrus_vga_mem_readb(opaque, addr + 1) << 8;
- v |= cirrus_vga_mem_readb(opaque, addr + 2) << 16;
- v |= cirrus_vga_mem_readb(opaque, addr + 3) << 24;
- return v;
-}
-
-static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
- uint32_t mem_value)
-{
- CirrusVGAState *s = opaque;
+ CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
unsigned bank_index;
unsigned bank_offset;
unsigned mode;
@@ -2032,8 +2014,6 @@ static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
return;
}

- addr &= 0x1ffff;
-
if (addr < 0x10000) {
if (s->cirrus_srcptr != s->cirrus_srcptr_end) {
/* bitblt */
@@ -2083,51 +2063,14 @@ static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
}
}

-static void cirrus_vga_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
-{
- cirrus_vga_mem_writeb(opaque, addr, val & 0xff);
- cirrus_vga_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
-}
-
-static void cirrus_vga_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
-{
- cirrus_vga_mem_writeb(opaque, addr, val & 0xff);
- cirrus_vga_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
- cirrus_vga_mem_writeb(opaque, addr + 2, (val >> 16) & 0xff);
- cirrus_vga_mem_writeb(opaque, addr + 3, (val >> 24) & 0xff);
-}
-
-static uint64_t cirrus_vga_mem_read(MemoryRegion *mr,
- target_phys_addr_t addr,
- uint32_t size)
-{
- CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
-
- switch (size) {
- case 1: return cirrus_vga_mem_readb(s, addr);
- case 2: return cirrus_vga_mem_readw(s, addr);
- case 4: return cirrus_vga_mem_readl(s, addr);
- default: abort();
- }
-}
-
-static void cirrus_vga_mem_write(MemoryRegion *mr, target_phys_addr_t addr,
- uint64_t data, unsigned size)
-{
- CirrusVGAState *s = container_of(mr, CirrusVGAState, low_mem);
-
- switch (size) {
- case 1: return cirrus_vga_mem_writeb(s, addr, data);
- case 2: return cirrus_vga_mem_writew(s, addr, data);
- case 4: return cirrus_vga_mem_writel(s, addr, data);
- default: abort();
- }
-};
-
static MemoryRegionOps cirrus_vga_mem_ops = {
.read = cirrus_vga_mem_read,
.write = cirrus_vga_mem_write,
.endianness = DEVICE_LITTLE_ENDIAN,
+ .impl = {
+ .min_access_size = 1,
+ .max_access_size = 1,
+ },
};

/***************************************
--
1.7.5.3