Support for MIPSsim, the cycle accurate MIPS simulator.

    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 129 insertions, 0 deletions

diff --git a/arch/mips/mips-boards/sim/sim_mem.c b/arch/mips/mips-boards/sim/sim_mem.c
new file mode 100644
index 000000000000..0dbd7435bb2a
--- /dev/null
+++ b/arch/mips/mips-boards/sim/sim_mem.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ */
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+
+#include <asm/bootinfo.h>
+#include <asm/page.h>
+
+#include <asm/mips-boards/prom.h>
+
+/*#define DEBUG*/
+
+enum simmem_memtypes {
+        simmem_reserved = 0,
+        simmem_free,
+};
+struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
+
+#ifdef DEBUG
+static char *mtypes[3] = {
+        "SIM reserved memory",
+        "SIM free memory",
+};
+#endif
+
+/* References to section boundaries */
+extern char _end;
+
+#define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
+
+
+struct prom_pmemblock * __init prom_getmdesc(void)
+{
+        unsigned int memsize;
+
+        memsize = 0x02000000;
+        prom_printf("Setting default memory size 0x%08x\n", memsize);
+
+        memset(mdesc, 0, sizeof(mdesc));
+
+        mdesc[0].type = simmem_reserved;
+        mdesc[0].base = 0x00000000;
+        mdesc[0].size = 0x00001000;
+
+        mdesc[1].type = simmem_free;
+        mdesc[1].base = 0x00001000;
+        mdesc[1].size = 0x000ff000;
+
+        mdesc[2].type = simmem_reserved;
+        mdesc[2].base = 0x00100000;
+        mdesc[2].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[2].base;
+
+        mdesc[3].type = simmem_free;
+        mdesc[3].base = CPHYSADDR(PFN_ALIGN(&_end));
+        mdesc[3].size = memsize - mdesc[3].base;
+
+        return &mdesc[0];
+}
+
+static int __init prom_memtype_classify (unsigned int type)
+{
+        switch (type) {
+        case simmem_free:
+                return BOOT_MEM_RAM;
+        case simmem_reserved:
+        default:
+                return BOOT_MEM_RESERVED;
+        }
+}
+
+void __init prom_meminit(void)
+{
+        struct prom_pmemblock *p;
+
+        p = prom_getmdesc();
+
+        while (p->size) {
+                long type;
+                unsigned long base, size;
+
+                type = prom_memtype_classify (p->type);
+                base = p->base;
+                size = p->size;
+
+                add_memory_region(base, size, type);
+                p++;
+        }
+}
+
+unsigned long __init prom_free_prom_memory(void)
+{
+        int i;
+        unsigned long freed = 0;
+        unsigned long addr;
+
+        for (i = 0; i < boot_mem_map.nr_map; i++) {
+                if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
+                        continue;
+
+                addr = boot_mem_map.map[i].addr;
+                while (addr < boot_mem_map.map[i].addr
+                              + boot_mem_map.map[i].size) {
+                        ClearPageReserved(virt_to_page(__va(addr)));
+                        set_page_count(virt_to_page(__va(addr)), 1);
+                        free_page((unsigned long)__va(addr));
+                        addr += PAGE_SIZE;
+                        freed += PAGE_SIZE;
+                }
+        }
+        printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
+
+        return freed;
+}