From 29e179bc3f5e804ab58b975e65c91cb9cd287846 Mon Sep 17 00:00:00 2001
From: aurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Fri, 22 Aug 2008 08:57:43 +0000
Subject: [sh4] memory mapped TLB entries

SH4 MMU's memory mapped TLB feature is implemented.
SH-Linux seems to write to memory mapped TLB to invalidate a TLB entry,
but does not to read it. So only memory write feature is implemented.
Work on memory read feature is left.

(Shin-ichiro KAWASAKI)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5067 c046a42c-6fe2-441c-8c8c-71466251a162
---
 hw/sh7750.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)

(limited to 'hw')

diff --git a/hw/sh7750.c b/hw/sh7750.c
index a76e6d4..0ff3e6d 100644
--- a/hw/sh7750.c
+++ b/hw/sh7750.c
@@ -30,6 +30,7 @@
 #include "sh7750_regs.h"
 #include "sh7750_regnames.h"
 #include "sh_intc.h"
+#include "cpu.h"
 
 #define NB_DEVICES 4
 
@@ -532,10 +533,113 @@ static struct intc_group groups_pci[] = {
 #define SH_CPU_SH7750_ALL (SH_CPU_SH7750 | SH_CPU_SH7750S | SH_CPU_SH7750R)
 #define SH_CPU_SH7751_ALL (SH_CPU_SH7751 | SH_CPU_SH7751R)
 
+/**********************************************************************
+ Memory mapped cache and TLB
+**********************************************************************/
+
+#define MM_REGION_MASK   0x07000000
+#define MM_ICACHE_ADDR   (0)
+#define MM_ICACHE_DATA   (1)
+#define MM_ITLB_ADDR     (2)
+#define MM_ITLB_DATA     (3)
+#define MM_OCACHE_ADDR   (4)
+#define MM_OCACHE_DATA   (5)
+#define MM_UTLB_ADDR     (6)
+#define MM_UTLB_DATA     (7)
+#define MM_REGION_TYPE(addr)  ((addr & MM_REGION_MASK) >> 24)
+
+static uint32_t invalid_read(void *opaque, target_phys_addr_t addr)
+{
+    assert(0);
+
+    return 0;
+}
+
+static uint32_t sh7750_mmct_readl(void *opaque, target_phys_addr_t addr)
+{
+    uint32_t ret = 0;
+
+    switch (MM_REGION_TYPE(addr)) {
+    case MM_ICACHE_ADDR:
+    case MM_ICACHE_DATA:
+        /* do nothing */
+	break;
+    case MM_ITLB_ADDR:
+    case MM_ITLB_DATA:
+        /* XXXXX */
+        assert(0);
+	break;
+    case MM_OCACHE_ADDR:
+    case MM_OCACHE_DATA:
+        /* do nothing */
+	break;
+    case MM_UTLB_ADDR:
+    case MM_UTLB_DATA:
+        /* XXXXX */
+        assert(0);
+	break;
+    default:
+        assert(0);
+    }
+
+    return ret;
+}
+
+static void invalid_write(void *opaque, target_phys_addr_t addr,
+			  uint32_t mem_value)
+{
+    assert(0);
+}
+
+static void sh7750_mmct_writel(void *opaque, target_phys_addr_t addr,
+				uint32_t mem_value)
+{
+    SH7750State *s = opaque;
+
+    switch (MM_REGION_TYPE(addr)) {
+    case MM_ICACHE_ADDR:
+    case MM_ICACHE_DATA:
+        /* do nothing */
+	break;
+    case MM_ITLB_ADDR:
+    case MM_ITLB_DATA:
+        /* XXXXX */
+        assert(0);
+	break;
+    case MM_OCACHE_ADDR:
+    case MM_OCACHE_DATA:
+        /* do nothing */
+	break;
+    case MM_UTLB_ADDR:
+        cpu_sh4_write_mmaped_utlb_addr(s->cpu, addr, mem_value);
+	break;
+    case MM_UTLB_DATA:
+        /* XXXXX */
+        assert(0);
+	break;
+    default:
+        assert(0);
+	break;
+    }
+}
+
+static CPUReadMemoryFunc *sh7750_mmct_read[] = {
+    invalid_read,
+    invalid_read,
+    sh7750_mmct_readl
+};
+
+static CPUWriteMemoryFunc *sh7750_mmct_write[] = {
+    invalid_write,
+    invalid_write,
+    sh7750_mmct_writel
+};
+
 SH7750State *sh7750_init(CPUSH4State * cpu)
 {
     SH7750State *s;
     int sh7750_io_memory;
+    int sh7750_mm_cache_and_tlb; /* memory mapped cache and tlb */
     int cpu_model = SH_CPU_SH7751R; /* for now */
 
     s = qemu_mallocz(sizeof(SH7750State));
@@ -546,6 +650,12 @@ SH7750State *sh7750_init(CPUSH4State * cpu)
 					      sh7750_mem_write, s);
     cpu_register_physical_memory(0x1c000000, 0x04000000, sh7750_io_memory);
 
+    sh7750_mm_cache_and_tlb = cpu_register_io_memory(0,
+						     sh7750_mmct_read,
+						     sh7750_mmct_write, s);
+    cpu_register_physical_memory(0xf0000000, 0x08000000,
+				 sh7750_mm_cache_and_tlb);
+
     sh_intc_init(&s->intc, NR_SOURCES,
 		 _INTC_ARRAY(mask_registers),
 		 _INTC_ARRAY(prio_registers));
-- 
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