patch-2.3.9 linux/arch/mips/baget/baget.c

• Lines: 105
• Date: Fri Jun 25 17:40:12 1999
• Orig file: v2.3.8/linux/arch/mips/baget/baget.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.8/linux/arch/mips/baget/baget.c linux/arch/mips/baget/baget.c
@@ -0,0 +1,104 @@
+/* $Id$
+ *
+ * baget.c: Baget low level stuff
+ *
+ * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
+ *
+ */
+#include <stdarg.h>
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <asm/system.h>
+#include <asm/bootinfo.h>
+#include <asm/mipsregs.h>
+#include <asm/pgtable.h>
+
+#include <asm/baget/baget.h>
+
+/* 
+ * Following values are set by BALO into RAM disk buffer parameters
+ */
+unsigned long balo_ramdisk_base = 0xBA;  /* Signature for BALO ! */
+unsigned long balo_ramdisk_size = 0;
+
+
+/*
+ *  Following code is based on routines from 'mm/vmalloc.c'
+ *  Additional parameters  ioaddr  is needed to iterate across real I/O address.
+ */
+static inline int alloc_area_pte(pte_t * pte, unsigned long address, 
+				 unsigned long size, unsigned long ioaddr)
+{
+        unsigned long end;
+
+        address &= ~PMD_MASK;
+        end = address + size;
+        if (end > PMD_SIZE)
+                end = PMD_SIZE;
+        while (address < end) {
+                unsigned long page;
+                if (!pte_none(*pte))
+                        printk("kseg2_alloc_io: page already exists\n");
+		/*
+		 *  For MIPS looks pretty to have transparent mapping
+		 *  for KSEG2 areas  -- user can't access one, and no 
+		 *  problems with  virtual <--> physical  translation.
+		 */
+                page = ioaddr & PAGE_MASK;
+
+                set_pte(pte, __pte(page | pgprot_val(PAGE_USERIO) |
+				  _PAGE_GLOBAL | __READABLE | __WRITEABLE));
+                address += PAGE_SIZE;
+		ioaddr  += PAGE_SIZE;
+                pte++;
+        }
+        return 0;
+}
+
+static inline int alloc_area_pmd(pmd_t * pmd, unsigned long address, 
+				 unsigned long size, unsigned long ioaddr)
+{
+        unsigned long end;
+
+        address &= ~PGDIR_MASK;
+        end = address + size;
+        if (end > PGDIR_SIZE)
+                end = PGDIR_SIZE;
+        while (address < end) {
+                pte_t * pte = pte_alloc_kernel(pmd, address);
+                if (!pte)
+                        return -ENOMEM;
+                if (alloc_area_pte(pte, address, end - address, ioaddr))
+                        return -ENOMEM;
+                address = (address + PMD_SIZE) & PMD_MASK;
+		ioaddr  += PMD_SIZE;
+                pmd++;
+        }
+        return 0;
+}
+
+int kseg2_alloc_io (unsigned long address, unsigned long size)
+{
+        pgd_t * dir;
+        unsigned long end = address + size;
+
+        dir = pgd_offset_k(address);
+        flush_cache_all();
+        while (address < end) {
+                pmd_t *pmd;
+                pgd_t olddir = *dir;
+
+                pmd = pmd_alloc_kernel(dir, address);
+                if (!pmd)
+                        return -ENOMEM;
+                if (alloc_area_pmd(pmd, address, end - address, address))
+                        return -ENOMEM;
+                if (pgd_val(olddir) != pgd_val(*dir))
+                        set_pgdir(address, *dir);
+                address = (address + PGDIR_SIZE) & PGDIR_MASK;
+                dir++;
+        }
+        flush_tlb_all();
+        return 0;
+}