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authorPeter Maydell <peter.maydell@linaro.org>2014-04-15 19:18:41 +0100
committerPeter Maydell <peter.maydell@linaro.org>2014-04-17 21:34:04 +0100
commitaca3f40b374428e9c01068cf96294483cbb760a0 (patch)
treeea0528c089b29a84a44cac1cd539d80917e51308 /include
parent9225d739e7f6ec8d2139f79c3d2e3282cc725364 (diff)
downloadhqemu-aca3f40b374428e9c01068cf96294483cbb760a0.zip
hqemu-aca3f40b374428e9c01068cf96294483cbb760a0.tar.gz
target-arm: A64: Implement DC ZVA
Implement the DC ZVA instruction, which clears a block of memory. The fast path obtains a pointer to the underlying RAM via the TCG TLB data structure so we can do a direct memset(), with fallback to a simple byte-store loop in the slow path. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Diffstat (limited to 'include')
-rw-r--r--include/exec/softmmu_exec.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/include/exec/softmmu_exec.h b/include/exec/softmmu_exec.h
index 6fde154..470db20 100644
--- a/include/exec/softmmu_exec.h
+++ b/include/exec/softmmu_exec.h
@@ -162,3 +162,55 @@
#define stw(p, v) stw_data(p, v)
#define stl(p, v) stl_data(p, v)
#define stq(p, v) stq_data(p, v)
+
+/**
+ * tlb_vaddr_to_host:
+ * @env: CPUArchState
+ * @addr: guest virtual address to look up
+ * @access_type: 0 for read, 1 for write, 2 for execute
+ * @mmu_idx: MMU index to use for lookup
+ *
+ * Look up the specified guest virtual index in the TCG softmmu TLB.
+ * If the TLB contains a host virtual address suitable for direct RAM
+ * access, then return it. Otherwise (TLB miss, TLB entry is for an
+ * I/O access, etc) return NULL.
+ *
+ * This is the equivalent of the initial fast-path code used by
+ * TCG backends for guest load and store accesses.
+ */
+static inline void *tlb_vaddr_to_host(CPUArchState *env, target_ulong addr,
+ int access_type, int mmu_idx)
+{
+ int index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
+ CPUTLBEntry *tlbentry = &env->tlb_table[mmu_idx][index];
+ target_ulong tlb_addr;
+ uintptr_t haddr;
+
+ switch (access_type) {
+ case 0:
+ tlb_addr = tlbentry->addr_read;
+ break;
+ case 1:
+ tlb_addr = tlbentry->addr_write;
+ break;
+ case 2:
+ tlb_addr = tlbentry->addr_code;
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ if ((addr & TARGET_PAGE_MASK)
+ != (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
+ /* TLB entry is for a different page */
+ return NULL;
+ }
+
+ if (tlb_addr & ~TARGET_PAGE_MASK) {
+ /* IO access */
+ return NULL;
+ }
+
+ haddr = addr + env->tlb_table[mmu_idx][index].addend;
+ return (void *)haddr;
+}
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