From 8d6ae7fb3a9c4369979bcc7188966fa725eed033 Mon Sep 17 00:00:00 2001
From: Richard Henderson
Date: Fri, 27 Oct 2017 16:26:36 +0200
Subject: target/hppa: Implement I*TLBA and I*TLBP insns

The TLB can now be populated, but it cannot yet be cleared.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/hppa/mem_helper.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 78 insertions(+), 2 deletions(-)

(limited to 'target/hppa/mem_helper.c')

diff --git a/target/hppa/mem_helper.c b/target/hppa/mem_helper.c
index 334ef98a32..59619e9ba8 100644
--- a/target/hppa/mem_helper.c
+++ b/target/hppa/mem_helper.c
@@ -42,13 +42,40 @@ static hppa_tlb_entry *hppa_find_tlb(CPUHPPAState *env, vaddr addr)
 
     for (i = 0; i < ARRAY_SIZE(env->tlb); ++i) {
         hppa_tlb_entry *ent = &env->tlb[i];
-        if (ent->va_b <= addr && addr <= ent->va_e && ent->entry_valid) {
+        if (ent->va_b <= addr && addr <= ent->va_e) {
             return ent;
         }
     }
     return NULL;
 }
 
+static void hppa_flush_tlb_ent(CPUHPPAState *env, hppa_tlb_entry *ent)
+{
+    CPUState *cs = CPU(hppa_env_get_cpu(env));
+    unsigned i, n = 1 << (2 * ent->page_size);
+    uint64_t addr = ent->va_b;
+
+    for (i = 0; i < n; ++i, addr += TARGET_PAGE_SIZE) {
+        /* Do not flush MMU_PHYS_IDX.  */
+        tlb_flush_page_by_mmuidx(cs, addr, 0xf);
+    }
+
+    memset(ent, 0, sizeof(*ent));
+    ent->va_b = -1;
+}
+
+static hppa_tlb_entry *hppa_alloc_tlb_ent(CPUHPPAState *env)
+{
+    hppa_tlb_entry *ent;
+    uint32_t i = env->tlb_last;
+
+    env->tlb_last = (i == ARRAY_SIZE(env->tlb) - 1 ? 0 : i + 1);
+    ent = &env->tlb[i];
+
+    hppa_flush_tlb_ent(env, ent);
+    return ent;
+}
+
 int hppa_get_physical_address(CPUHPPAState *env, vaddr addr, int mmu_idx,
                               int type, hwaddr *pphys, int *pprot)
 {
@@ -66,7 +93,7 @@ int hppa_get_physical_address(CPUHPPAState *env, vaddr addr, int mmu_idx,
 
     /* Find a valid tlb entry that matches the virtual address.  */
     ent = hppa_find_tlb(env, addr);
-    if (ent == NULL) {
+    if (ent == NULL || !ent->entry_valid) {
         phys = 0;
         prot = 0;
         ret = (type & PAGE_EXEC ? EXCP_ITLB_MISS : EXCP_DTLB_MISS);
@@ -201,4 +228,53 @@ void tlb_fill(CPUState *cs, target_ulong addr, int size,
     tlb_set_page(cs, addr & TARGET_PAGE_MASK, phys & TARGET_PAGE_MASK,
                  prot, mmu_idx, TARGET_PAGE_SIZE);
 }
+
+/* Insert (Insn/Data) TLB Address.  Note this is PA 1.1 only.  */
+void HELPER(itlba)(CPUHPPAState *env, target_ulong addr, target_ureg reg)
+{
+    hppa_tlb_entry *empty = NULL;
+    int i;
+
+    /* Zap any old entries covering ADDR; notice empty entries on the way.  */
+    for (i = 0; i < ARRAY_SIZE(env->tlb); ++i) {
+        hppa_tlb_entry *ent = &env->tlb[i];
+        if (!ent->entry_valid) {
+            empty = ent;
+        } else if (ent->va_b <= addr && addr <= ent->va_e) {
+            hppa_flush_tlb_ent(env, ent);
+            empty = ent;
+        }
+    }
+
+    /* If we didn't see an empty entry, evict one.  */
+    if (empty == NULL) {
+        empty = hppa_alloc_tlb_ent(env);
+    }
+
+    /* Note that empty->entry_valid == 0 already.  */
+    empty->va_b = addr & TARGET_PAGE_MASK;
+    empty->va_e = empty->va_b + TARGET_PAGE_SIZE - 1;
+    empty->pa = extract32(reg, 5, 20) << TARGET_PAGE_BITS;
+}
+
+/* Insert (Insn/Data) TLB Protection.  Note this is PA 1.1 only.  */
+void HELPER(itlbp)(CPUHPPAState *env, target_ulong addr, target_ureg reg)
+{
+    hppa_tlb_entry *ent = hppa_find_tlb(env, addr);
+
+    if (unlikely(ent == NULL || ent->entry_valid)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "ITLBP not following ITLBA\n");
+        return;
+    }
+
+    ent->access_id = extract32(reg, 1, 18);
+    ent->u = extract32(reg, 19, 1);
+    ent->ar_pl2 = extract32(reg, 20, 2);
+    ent->ar_pl1 = extract32(reg, 22, 2);
+    ent->ar_type = extract32(reg, 24, 3);
+    ent->b = extract32(reg, 27, 1);
+    ent->d = extract32(reg, 28, 1);
+    ent->t = extract32(reg, 29, 1);
+    ent->entry_valid = 1;
+}
 #endif /* CONFIG_USER_ONLY */
-- 
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