From: Jan Kiszka jan.kis...@siemens.com
This will allow to add support for unaligned memory regions: the subpage
container region can activate unaligned support unconditionally because
the read/write handler will now ensure that accesses are split as
required by calling address_space_rw. We can furthermore drop the
special handling of RAM subpages, address_space_rw takes care of this
already.
Signed-off-by: Jan Kiszka jan.kis...@siemens.com
Signed-off-by: Paolo Bonzini pbonz...@redhat.com
---
exec.c | 125 +
1 file changed, 47 insertions(+), 78 deletions(-)
diff --git a/exec.c b/exec.c
index ddc51a6..bf374e4 100644
--- a/exec.c
+++ b/exec.c
@@ -66,7 +66,7 @@ AddressSpace address_space_memory;
DMAContext dma_context_memory;
MemoryRegion io_mem_rom, io_mem_notdirty;
-static MemoryRegion io_mem_unassigned, io_mem_subpage_ram;
+static MemoryRegion io_mem_unassigned;
#endif
@@ -95,11 +95,13 @@ struct AddressSpaceDispatch {
*/
PhysPageEntry phys_map;
MemoryListener listener;
+AddressSpace *as;
};
#define SUBPAGE_IDX(addr) ((addr) ~TARGET_PAGE_MASK)
typedef struct subpage_t {
MemoryRegion iomem;
+AddressSpace *as;
hwaddr base;
uint16_t sub_section[TARGET_PAGE_SIZE];
} subpage_t;
@@ -729,7 +731,7 @@ hwaddr memory_region_section_get_iotlb(CPUArchState *env,
static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
uint16_t section);
-static subpage_t *subpage_init(hwaddr base);
+static subpage_t *subpage_init(AddressSpace *as, hwaddr base);
static void destroy_page_desc(uint16_t section_index)
{
MemoryRegionSection *section = phys_sections[section_index];
@@ -806,7 +808,7 @@ static void register_subpage(AddressSpaceDispatch *d,
MemoryRegionSection *secti
assert(existing-mr-subpage || existing-mr == io_mem_unassigned);
if (!(existing-mr-subpage)) {
-subpage = subpage_init(base);
+subpage = subpage_init(d-as, base);
subsection.mr = subpage-iomem;
phys_page_set(d, base TARGET_PAGE_BITS, 1,
phys_section_add(subsection));
@@ -1569,60 +1571,64 @@ static const MemoryRegionOps watch_mem_ops = {
static uint64_t subpage_read(void *opaque, hwaddr addr,
unsigned len)
{
-subpage_t *mmio = opaque;
-unsigned int idx = SUBPAGE_IDX(addr);
-uint64_t val;
+subpage_t *subpage = opaque;
+uint8_t buf[4];
-MemoryRegionSection *section;
#if defined(DEBUG_SUBPAGE)
-printf(%s: subpage %p len %d addr TARGET_FMT_plx idx %d\n, __func__,
- mmio, len, addr, idx);
+printf(%s: subpage %p len %d addr TARGET_FMT_plx \n, __func__,
+ subpage, len, addr);
#endif
-
-section = phys_sections[mmio-sub_section[idx]];
-addr += mmio-base;
-addr -= section-offset_within_address_space;
-addr += section-offset_within_region;
-io_mem_read(section-mr, addr, val, len);
-return val;
+address_space_read(subpage-as, addr + subpage-base, buf, len);
+switch (len) {
+case 1:
+return ldub_p(buf);
+case 2:
+return lduw_p(buf);
+case 4:
+return ldl_p(buf);
+default:
+abort();
+}
}
static void subpage_write(void *opaque, hwaddr addr,
uint64_t value, unsigned len)
{
-subpage_t *mmio = opaque;
-unsigned int idx = SUBPAGE_IDX(addr);
-MemoryRegionSection *section;
+subpage_t *subpage = opaque;
+uint8_t buf[4];
+
#if defined(DEBUG_SUBPAGE)
printf(%s: subpage %p len %d addr TARGET_FMT_plx
-idx %d value %PRIx64\n,
- __func__, mmio, len, addr, idx, value);
+value %PRIx64\n,
+ __func__, subpage, len, addr, value);
#endif
-
-section = phys_sections[mmio-sub_section[idx]];
-addr += mmio-base;
-addr -= section-offset_within_address_space;
-addr += section-offset_within_region;
-io_mem_write(section-mr, addr, value, len);
+switch (len) {
+case 1:
+stb_p(buf, value);
+break;
+case 2:
+stw_p(buf, value);
+break;
+case 4:
+stl_p(buf, value);
+break;
+default:
+abort();
+}
+address_space_write(subpage-as, addr + subpage-base, buf, len);
}
static bool subpage_accepts(void *opaque, hwaddr addr,
unsigned size, bool is_write)
{
-subpage_t *mmio = opaque;
-unsigned int idx = SUBPAGE_IDX(addr);
-MemoryRegionSection *section;
+subpage_t *subpage = opaque;
#if defined(DEBUG_SUBPAGE)
-printf(%s: subpage %p %c len %d addr TARGET_FMT_plx
-idx %d\n, __func__, mmio,
- is_write ? 'w' : 'r', len, addr, idx);
+printf(%s: subpage %p %c len %d addr TARGET_FMT_plx \n,
+ __func__, subpage, is_write ? 'w' : 'r', len, addr);
#endif
-section = phys_sections[mmio-sub_section[idx]];
-addr
