[Blackfin] arch: Initial checkin of the memory protection support.

[safe/jmp/linux-2.6] / arch / blackfin / kernel / cplb-mpu / cplbinit.c

diff --git a/arch/blackfin/kernel/cplb-mpu/cplbinit.c b/arch/blackfin/kernel/cplb-mpu/cplbinit.c
new file mode 100644 (file)
index 0000000..e2e2b50
--- /dev/null
+++ b/arch/blackfin/kernel/cplb-mpu/cplbinit.c
@@ -0,0 +1,91 @@
+/*
+ * Blackfin CPLB initialization
+ *
+ *               Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <linux/module.h>
+
+#include <asm/blackfin.h>
+#include <asm/cplb.h>
+#include <asm/cplbinit.h>
+
+struct cplb_entry icplb_tbl[MAX_CPLBS];
+struct cplb_entry dcplb_tbl[MAX_CPLBS];
+
+int first_switched_icplb, first_switched_dcplb;
+int first_mask_dcplb;
+
+void __init generate_cpl_tables(void)
+{
+       int i_d, i_i;
+       unsigned long addr;
+       unsigned long d_data, i_data;
+       unsigned long d_cache = 0, i_cache = 0;
+
+#ifdef CONFIG_BFIN_ICACHE
+       i_cache = CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
+#endif
+
+#ifdef CONFIG_BFIN_DCACHE
+       d_cache = CPLB_L1_CHBL;
+#ifdef CONFIG_BLKFIN_WT
+       d_cache |= CPLB_L1_AOW | CPLB_WT;
+#endif
+#endif
+       i_d = i_i = 0;
+
+       /* Set up the zero page.  */
+       dcplb_tbl[i_d].addr = 0;
+       dcplb_tbl[i_d++].data = SDRAM_OOPS | PAGE_SIZE_1KB;
+
+#if 0
+       icplb_tbl[i_i].addr = 0;
+       icplb_tbl[i_i++].data = i_cache | CPLB_USER_RD | PAGE_SIZE_4KB;
+#endif
+
+       /* Cover kernel memory with 4M pages.  */
+       addr = 0;
+       d_data = d_cache | CPLB_SUPV_WR | CPLB_VALID | PAGE_SIZE_4MB | CPLB_DIRTY;
+       i_data = i_cache | CPLB_VALID | CPLB_PORTPRIO | PAGE_SIZE_4MB;
+
+       for (; addr < memory_start; addr += 4 * 1024 * 1024) {
+               dcplb_tbl[i_d].addr = addr;
+               dcplb_tbl[i_d++].data = d_data;
+               icplb_tbl[i_i].addr = addr;
+               icplb_tbl[i_i++].data = i_data | (addr == 0 ? CPLB_USER_RD : 0);
+       }
+
+       /* Cover L1 memory.  One 4M area for code and data each is enough.  */
+#if L1_DATA_A_LENGTH > 0 || L1_DATA_B_LENGTH > 0
+       dcplb_tbl[i_d].addr = L1_DATA_A_START;
+       dcplb_tbl[i_d++].data = L1_DMEMORY | PAGE_SIZE_4MB;
+#endif
+       icplb_tbl[i_i].addr = L1_CODE_START;
+       icplb_tbl[i_i++].data = L1_IMEMORY | PAGE_SIZE_4MB;
+
+       first_mask_dcplb = i_d;
+       first_switched_dcplb = i_d + (1 << page_mask_order);
+       first_switched_icplb = i_i;
+
+       while (i_d < MAX_CPLBS)
+               dcplb_tbl[i_d++].data = 0;
+       while (i_i < MAX_CPLBS)
+               icplb_tbl[i_i++].data = 0;
+}