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

Enable it with CONFIG_MPU.

Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Bernd Schmidt 2008-01-27 18:39:16 +08:00 committed by Bryan Wu
parent 2047e40d72
commit b97b8a9983
15 changed files with 822 additions and 8 deletions
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9
arch/blackfin/Kconfig
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@ -765,6 +765,15 @@ config L1_MAX_PIECE
Set the max memory pieces for the L1 SRAM allocation algorithm.
Min value is 16. Max value is 1024.
config MPU
bool "Enable the memory protection unit (EXPERIMENTAL)"
default n
help
Use the processor's MPU to protect applications from accessing
memory they do not own. This comes at a performance penalty
and is recommended only for debugging.
comment "Asynchonous Memory Configuration"
menu "EBIU_AMGCTL Global Control"

6
arch/blackfin/Makefile
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@ -82,7 +82,11 @@ core-y += arch/$(ARCH)/mach-$(MACHINE)/
core-y += arch/$(ARCH)/mach-$(MACHINE)/boards/
endif
core-y += arch/$(ARCH)/kernel/cplb-nompu/
ifeq ($(CONFIG_MPU),y)
core-y += arch/$(ARCH)/kernel/cplb-mpu/
else
core-y += arch/$(ARCH)/kernel/cplb-nompu/
endif
libs-y += arch/$(ARCH)/lib/

8
arch/blackfin/kernel/cplb-mpu/Makefile Normal file
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@ -0,0 +1,8 @@
#
# arch/blackfin/kernel/cplb-nompu/Makefile
#
obj-y := cplbinit.o cacheinit.o cplbmgr.o
obj-$(CONFIG_CPLB_INFO) += cplbinfo.o

62
arch/blackfin/kernel/cplb-mpu/cacheinit.c Normal file
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@ -0,0 +1,62 @@
/*
* Copyright 2004-2007 Analog Devices Inc.
*
* 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/cpu.h>
#include <asm/cacheflush.h>
#include <asm/blackfin.h>
#include <asm/cplb.h>
#include <asm/cplbinit.h>
#if defined(CONFIG_BFIN_ICACHE)
void bfin_icache_init(void)
{
unsigned long ctrl;
int i;
SSYNC();
for (i = 0; i < MAX_CPLBS; i++) {
bfin_write32(ICPLB_ADDR0 + i * 4, icplb_tbl[i].addr);
bfin_write32(ICPLB_DATA0 + i * 4, icplb_tbl[i].data);
}
ctrl = bfin_read_IMEM_CONTROL();
ctrl |= IMC | ENICPLB;
bfin_write_IMEM_CONTROL(ctrl);
SSYNC();
}
#endif
#if defined(CONFIG_BFIN_DCACHE)
void bfin_dcache_init(void)
{
unsigned long ctrl;
int i;
SSYNC();
for (i = 0; i < MAX_CPLBS; i++) {
bfin_write32(DCPLB_ADDR0 + i * 4, dcplb_tbl[i].addr);
bfin_write32(DCPLB_DATA0 + i * 4, dcplb_tbl[i].data);
}
ctrl = bfin_read_DMEM_CONTROL();
ctrl |= DMEM_CNTR;
bfin_write_DMEM_CONTROL(ctrl);
SSYNC();
}
#endif

144
arch/blackfin/kernel/cplb-mpu/cplbinfo.c Normal file
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@ -0,0 +1,144 @@
/*
* File: arch/blackfin/mach-common/cplbinfo.c
* Based on:
* Author: Sonic Zhang <sonic.zhang@analog.com>
*
* Created: Jan. 2005
* Description: Display CPLB status
*
* Modified:
* Copyright 2004-2006 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 <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include <asm/current.h>
#include <asm/system.h>
#include <asm/cplb.h>
#include <asm/cplbinit.h>
#include <asm/blackfin.h>
#define CPLB_I 1
#define CPLB_D 2
#define SYNC_SYS SSYNC()
#define SYNC_CORE CSYNC()
#define CPLB_BIT_PAGESIZE 0x30000
static char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" };
static char *cplb_print_entry(char *buf, struct cplb_entry *tbl, int switched)
{
int i;
buf += sprintf(buf, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
for (i = 0; i < MAX_CPLBS; i++) {
unsigned long data = tbl[i].data;
unsigned long addr = tbl[i].addr;
if (!(data & CPLB_VALID))
continue;
buf +=
sprintf(buf,
"%d\t0x%08lx\t%06lx\t%s\t%c\t%c\t%c\t%c\n",
i, addr, data,
page_size_string_table[(data & 0x30000) >> 16],
(data & CPLB_USER_RD) ? 'Y' : 'N',
(data & CPLB_USER_WR) ? 'Y' : 'N',
(data & CPLB_SUPV_WR) ? 'Y' : 'N',
i < switched ? 'N' : 'Y');
}
buf += sprintf(buf, "\n");
return buf;
}
int cplbinfo_proc_output(char *buf)
{
char *p;
p = buf;
p += sprintf(p, "------------------ CPLB Information ------------------\n\n");
if (bfin_read_IMEM_CONTROL() & ENICPLB) {
p += sprintf(p, "Instruction CPLB entry:\n");
p = cplb_print_entry(p, icplb_tbl, first_switched_icplb);
} else
p += sprintf(p, "Instruction CPLB is disabled.\n\n");
if (1 || bfin_read_DMEM_CONTROL() & ENDCPLB) {
p += sprintf(p, "Data CPLB entry:\n");
p = cplb_print_entry(p, dcplb_tbl, first_switched_dcplb);
} else
p += sprintf(p, "Data CPLB is disabled.\n");
p += sprintf(p, "ICPLB miss: %d\nICPLB supervisor miss: %d\n",
nr_icplb_miss, nr_icplb_supv_miss);
p += sprintf(p, "DCPLB miss: %d\nDCPLB protection fault:%d\n",
nr_dcplb_miss, nr_dcplb_prot);
p += sprintf(p, "CPLB flushes: %d\n",
nr_cplb_flush);
return p - buf;
}
static int cplbinfo_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len;
len = cplbinfo_proc_output(page);
if (len <= off + count)
*eof = 1;
*start = page + off;
len -= off;
if (len > count)
len = count;
if (len < 0)
len = 0;
return len;
}
static int __init cplbinfo_init(void)
{
struct proc_dir_entry *entry;
entry = create_proc_entry("cplbinfo", 0, NULL);
if (!entry)
return -ENOMEM;
entry->read_proc = cplbinfo_read_proc;
entry->data = NULL;
return 0;
}
static void __exit cplbinfo_exit(void)
{
remove_proc_entry("cplbinfo", NULL);
}
module_init(cplbinfo_init);
module_exit(cplbinfo_exit);

91
arch/blackfin/kernel/cplb-mpu/cplbinit.c Normal file
View File

@ -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;
}

338
arch/blackfin/kernel/cplb-mpu/cplbmgr.c Normal file
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@ -0,0 +1,338 @@
/*
* Blackfin CPLB exception handling.
* Copyright 2004-2007 Analog Devices Inc.
*
* 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 <linux/mm.h>
#include <asm/blackfin.h>
#include <asm/cplbinit.h>
#include <asm/mmu_context.h>
#ifdef CONFIG_BFIN_ICACHE
#define FAULT_RW (1 << 16)
#define FAULT_USERSUPV (1 << 17)
int page_mask_nelts;
int page_mask_order;
unsigned long *current_rwx_mask;
int nr_dcplb_miss, nr_icplb_miss, nr_icplb_supv_miss, nr_dcplb_prot;
int nr_cplb_flush;
static inline void disable_dcplb(void)
{
unsigned long ctrl;
SSYNC();
ctrl = bfin_read_DMEM_CONTROL();
ctrl &= ~ENDCPLB;
bfin_write_DMEM_CONTROL(ctrl);
SSYNC();
}
static inline void enable_dcplb(void)
{
unsigned long ctrl;
SSYNC();
ctrl = bfin_read_DMEM_CONTROL();
ctrl |= ENDCPLB;
bfin_write_DMEM_CONTROL(ctrl);
SSYNC();
}
static inline void disable_icplb(void)
{
unsigned long ctrl;
SSYNC();
ctrl = bfin_read_IMEM_CONTROL();
ctrl &= ~ENICPLB;
bfin_write_IMEM_CONTROL(ctrl);
SSYNC();
}
static inline void enable_icplb(void)
{
unsigned long ctrl;
SSYNC();
ctrl = bfin_read_IMEM_CONTROL();
ctrl |= ENICPLB;
bfin_write_IMEM_CONTROL(ctrl);
SSYNC();
}
/*
* Given the contents of the status register, return the index of the
* CPLB that caused the fault.
*/
static inline int faulting_cplb_index(int status)
{
int signbits = __builtin_bfin_norm_fr1x32(status & 0xFFFF);
return 30 - signbits;
}
/*
* Given the contents of the status register and the DCPLB_DATA contents,
* return true if a write access should be permitted.
*/
static inline int write_permitted(int status, unsigned long data)
{
if (status & FAULT_USERSUPV)
return !!(data & CPLB_SUPV_WR);
else
return !!(data & CPLB_USER_WR);
}
/* Counters to implement round-robin replacement. */
static int icplb_rr_index, dcplb_rr_index;
/*
* Find an ICPLB entry to be evicted and return its index.
*/
static int evict_one_icplb(void)
{
int i;
for (i = first_switched_icplb; i < MAX_CPLBS; i++)
if ((icplb_tbl[i].data & CPLB_VALID) == 0)
return i;
i = first_switched_icplb + icplb_rr_index;
if (i >= MAX_CPLBS) {
i -= MAX_CPLBS - first_switched_icplb;
icplb_rr_index -= MAX_CPLBS - first_switched_icplb;
}
icplb_rr_index++;
return i;
}
static int evict_one_dcplb(void)
{
int i;
for (i = first_switched_dcplb; i < MAX_CPLBS; i++)
if ((dcplb_tbl[i].data & CPLB_VALID) == 0)
return i;
i = first_switched_dcplb + dcplb_rr_index;
if (i >= MAX_CPLBS) {
i -= MAX_CPLBS - first_switched_dcplb;
dcplb_rr_index -= MAX_CPLBS - first_switched_dcplb;
}
dcplb_rr_index++;
return i;
}
static noinline int dcplb_miss(void)
{
unsigned long addr = bfin_read_DCPLB_FAULT_ADDR();
int status = bfin_read_DCPLB_STATUS();
unsigned long *mask;
int idx;
unsigned long d_data;
nr_dcplb_miss++;
if (addr >= _ramend)
return CPLB_PROT_VIOL;
d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_DCACHE
d_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#ifdef CONFIG_BLKFIN_WT
d_data |= CPLB_L1_AOW | CPLB_WT;
#endif
#endif
mask = current_rwx_mask;
if (mask) {
int page = addr >> PAGE_SHIFT;
int offs = page >> 5;
int bit = 1 << (page & 31);
if (mask[offs] & bit)
d_data |= CPLB_USER_RD;
mask += page_mask_nelts;
if (mask[offs] & bit)
d_data |= CPLB_USER_WR;
}
idx = evict_one_dcplb();
addr &= PAGE_MASK;
dcplb_tbl[idx].addr = addr;
dcplb_tbl[idx].data = d_data;
disable_dcplb();
bfin_write32(DCPLB_DATA0 + idx * 4, d_data);
bfin_write32(DCPLB_ADDR0 + idx * 4, addr);
enable_dcplb();
return 0;
}
static noinline int icplb_miss(void)
{
unsigned long addr = bfin_read_ICPLB_FAULT_ADDR();
int status = bfin_read_ICPLB_STATUS();
int idx;
unsigned long i_data;
nr_icplb_miss++;
if (status & FAULT_USERSUPV)
nr_icplb_supv_miss++;
if (addr >= _ramend)
return CPLB_PROT_VIOL;
/*
* First, try to find a CPLB that matches this address. If we
* find one, then the fact that we're in the miss handler means
* that the instruction crosses a page boundary.
*/
for (idx = first_switched_icplb; idx < MAX_CPLBS; idx++) {
if (icplb_tbl[idx].data & CPLB_VALID) {
unsigned long this_addr = icplb_tbl[idx].addr;
if (this_addr <= addr && this_addr + PAGE_SIZE > addr) {
addr += PAGE_SIZE;
break;
}
}
}
i_data = CPLB_VALID | CPLB_PORTPRIO | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_ICACHE
i_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#endif
/*
* Two cases to distinguish - a supervisor access must necessarily
* be for a module page; we grant it unconditionally (could do better
* here in the future). Otherwise, check the x bitmap of the current
* process.
*/
if (!(status & FAULT_USERSUPV)) {
unsigned long *mask = current_rwx_mask;
if (mask) {
int page = addr >> PAGE_SHIFT;
int offs = page >> 5;
int bit = 1 << (page & 31);
mask += 2 * page_mask_nelts;
if (mask[offs] & bit)
i_data |= CPLB_USER_RD;
}
}
idx = evict_one_icplb();
addr &= PAGE_MASK;
icplb_tbl[idx].addr = addr;
icplb_tbl[idx].data = i_data;
disable_icplb();
bfin_write32(ICPLB_DATA0 + idx * 4, i_data);
bfin_write32(ICPLB_ADDR0 + idx * 4, addr);
enable_icplb();
return 0;
}
static noinline int dcplb_protection_fault(void)
{
unsigned long addr = bfin_read_DCPLB_FAULT_ADDR();
int status = bfin_read_DCPLB_STATUS();
nr_dcplb_prot++;
if (status & FAULT_RW) {
int idx = faulting_cplb_index(status);
unsigned long data = dcplb_tbl[idx].data;
if (!(data & CPLB_WT) && !(data & CPLB_DIRTY) &&
write_permitted(status, data)) {
data |= CPLB_DIRTY;
dcplb_tbl[idx].data = data;
bfin_write32(DCPLB_DATA0 + idx * 4, data);
return 0;
}
}
return CPLB_PROT_VIOL;
}
int cplb_hdr(int seqstat, struct pt_regs *regs)
{
int cause = seqstat & 0x3f;
switch (cause) {
case 0x23:
return dcplb_protection_fault();
case 0x2C:
return icplb_miss();
case 0x26:
return dcplb_miss();
default:
return 1;
panic_cplb_error(seqstat, regs);
}
}
void flush_switched_cplbs(void)
{
int i;
nr_cplb_flush++;
disable_icplb();
for (i = first_switched_icplb; i < MAX_CPLBS; i++) {
icplb_tbl[i].data = 0;
bfin_write32(ICPLB_DATA0 + i * 4, 0);
}
enable_icplb();
disable_dcplb();
for (i = first_mask_dcplb; i < MAX_CPLBS; i++) {
dcplb_tbl[i].data = 0;
bfin_write32(DCPLB_DATA0 + i * 4, 0);
}
enable_dcplb();
}
void set_mask_dcplbs(unsigned long *masks)
{
int i;
unsigned long addr = (unsigned long)masks;
unsigned long d_data;
current_rwx_mask = masks;
if (!masks)
return;
d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_DCACHE
d_data |= CPLB_L1_CHBL;
#ifdef CONFIG_BLKFIN_WT
d_data |= CPLB_L1_AOW | CPLB_WT;
#endif
#endif
disable_dcplb();
for (i = first_mask_dcplb; i < first_switched_dcplb; i++) {
dcplb_tbl[i].addr = addr;
dcplb_tbl[i].data = d_data;
bfin_write32(DCPLB_DATA0 + i * 4, d_data);
bfin_write32(DCPLB_ADDR0 + i * 4, addr);
addr += PAGE_SIZE;
}
enable_dcplb();
}
#endif

10
arch/blackfin/kernel/setup.c
View File

@ -238,7 +238,12 @@ void __init setup_arch(char **cmdline_p)
memory_end = _ramend - DMA_UNCACHED_REGION;
_ramstart = (unsigned long)__bss_stop;
#ifdef CONFIG_MPU
/* Round up to multiple of 4MB. */
memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
#else
memory_start = PAGE_ALIGN(_ramstart);
#endif
#if defined(CONFIG_MTD_UCLINUX)
/* generic memory mapped MTD driver */
@ -307,6 +312,11 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
#endif /* ANOMALY_05000263 */
#ifdef CONFIG_MPU
page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
#endif
#if !defined(CONFIG_MTD_UCLINUX)
memory_end -= SIZE_4K; /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
#endif

19
arch/blackfin/mach-common/entry.S
View File

@ -95,24 +95,43 @@ ENTRY(_ex_workaround_261)
R6 = 0x26; /* Data CPLB Miss */
cc = R6 == R7;
if cc jump _ex_dcplb_miss (BP);
R6 = 0x23; /* Data CPLB Miss */
cc = R6 == R7;
if cc jump _ex_dcplb_viol (BP);
/* Handle 0x23 Data CPLB Protection Violation
* and Data CPLB Multiple Hits - Linux Trap Zero
*/
jump _ex_trap_c;
ENDPROC(_ex_workaround_261)
#else
#ifdef CONFIG_MPU
#define _ex_dviol _ex_dcplb_viol
#else
#define _ex_dviol _ex_trap_c
#endif
#define _ex_dmiss _ex_dcplb_miss
#define _ex_dmult _ex_trap_c
#endif
ENTRY(_ex_dcplb_viol)
ENTRY(_ex_dcplb_miss)
ENTRY(_ex_icplb_miss)
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
SAVE_ALL_SYS
#ifdef CONFIG_MPU
R0 = SEQSTAT;
R1 = SP;
sp += -12;
call _cplb_hdr;
sp += 12;
CC = R0 == 0;
IF !CC JUMP _handle_bad_cplb;
#else
call __cplb_hdr;
#endif
DEBUG_START_HWTRACE(p5, r7)
RESTORE_ALL_SYS
SP = EX_SCRATCH_REG;

4
arch/blackfin/mm/init.c
View File

@ -184,13 +184,15 @@ static __init void free_init_pages(const char *what, unsigned long begin, unsign
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
#ifndef CONFIG_MPU
free_init_pages("initrd memory", start, end);
#endif
}
#endif
void __init free_initmem(void)
{
#ifdef CONFIG_RAMKERNEL
#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
free_init_pages("unused kernel memory",
(unsigned long)(&__init_begin),
(unsigned long)(&__init_end));

61
include/asm-blackfin/cplb-mpu.h Normal file
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@ -0,0 +1,61 @@
/*
* File: include/asm-blackfin/cplbinit.h
* Based on:
* Author:
*
* Created:
* Description:
*
* Modified:
* Copyright 2004-2006 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
*/
#ifndef __ASM_BFIN_CPLB_MPU_H
#define __ASM_BFIN_CPLB_MPU_H
struct cplb_entry {
unsigned long data, addr;
};
struct mem_region {
unsigned long start, end;
unsigned long dcplb_data;
unsigned long icplb_data;
};
extern struct cplb_entry dcplb_tbl[MAX_CPLBS];
extern struct cplb_entry icplb_tbl[MAX_CPLBS];
extern int first_switched_icplb;
extern int first_mask_dcplb;
extern int first_switched_dcplb;
extern int nr_dcplb_miss, nr_icplb_miss, nr_icplb_supv_miss, nr_dcplb_prot;
extern int nr_cplb_flush;
extern int page_mask_order;
extern int page_mask_nelts;
extern unsigned long *current_rwx_mask;
extern void flush_switched_cplbs(void);
extern void set_mask_dcplbs(unsigned long *);
extern void __noreturn panic_cplb_error(int seqstat, struct pt_regs *);
#endif /* __ASM_BFIN_CPLB_MPU_H */

4
include/asm-blackfin/cplb.h
View File

@ -65,7 +65,11 @@
#define SIZE_1M 0x00100000 /* 1M */
#define SIZE_4M 0x00400000 /* 4M */
#ifdef CONFIG_MPU
#define MAX_CPLBS 16
#else
#define MAX_CPLBS (16 * 2)
#endif
#define ASYNC_MEMORY_CPLB_COVERAGE ((ASYNC_BANK0_SIZE + ASYNC_BANK1_SIZE + \
ASYNC_BANK2_SIZE + ASYNC_BANK3_SIZE) / SIZE_4M)

8
include/asm-blackfin/cplbinit.h
View File

@ -33,6 +33,12 @@
#include <asm/blackfin.h>
#include <asm/cplb.h>
#ifdef CONFIG_MPU
#include <asm/cplb-mpu.h>
#else
#define INITIAL_T 0x1
#define SWITCH_T 0x2
#define I_CPLB 0x4
@ -79,6 +85,8 @@ extern u_long ipdt_swapcount_table[];
extern u_long dpdt_swapcount_table[];
#endif
#endif /* CONFIG_MPU */
extern unsigned long reserved_mem_dcache_on;
extern unsigned long reserved_mem_icache_on;

4
include/asm-blackfin/mmu.h
View File

@ -24,7 +24,9 @@ typedef struct {
unsigned long exec_fdpic_loadmap;
unsigned long interp_fdpic_loadmap;
#endif
#ifdef CONFIG_MPU
unsigned long *page_rwx_mask;
#endif
} mm_context_t;
#endif

62
include/asm-blackfin/mmu_context.h
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@ -30,9 +30,12 @@
#ifndef __BLACKFIN_MMU_CONTEXT_H__
#define __BLACKFIN_MMU_CONTEXT_H__
#include <linux/gfp.h>
#include <linux/sched.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/cplbinit.h>
extern void *current_l1_stack_save;
extern int nr_l1stack_tasks;
@ -50,6 +53,12 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
#ifdef CONFIG_MPU
unsigned long p = __get_free_pages(GFP_KERNEL, page_mask_order);
mm->context.page_rwx_mask = (unsigned long *)p;
memset(mm->context.page_rwx_mask, 0,
page_mask_nelts * 3 * sizeof(long));
#endif
return 0;
}
@ -73,6 +82,11 @@ static inline void destroy_context(struct mm_struct *mm)
sram_free(tmp->addr);
kfree(tmp);
}
#ifdef CONFIG_MPU
if (current_rwx_mask == mm->context.page_rwx_mask)
current_rwx_mask = NULL;
free_pages((unsigned long)mm->context.page_rwx_mask, page_mask_order);
#endif
}
static inline unsigned long
@ -106,9 +120,21 @@ activate_l1stack(struct mm_struct *mm, unsigned long sp_base)
#define deactivate_mm(tsk,mm) do { } while (0)
static inline void activate_mm(struct mm_struct *prev_mm,
struct mm_struct *next_mm)
#define activate_mm(prev, next) switch_mm(prev, next, NULL)
static inline void switch_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm,
struct task_struct *tsk)
{
if (prev_mm == next_mm)
return;
#ifdef CONFIG_MPU
if (prev_mm->context.page_rwx_mask == current_rwx_mask) {
flush_switched_cplbs();
set_mask_dcplbs(next_mm->context.page_rwx_mask);
}
#endif
/* L1 stack switching. */
if (!next_mm->context.l1_stack_save)
return;
if (next_mm->context.l1_stack_save == current_l1_stack_save)
@ -120,10 +146,36 @@ static inline void activate_mm(struct mm_struct *prev_mm,
memcpy(l1_stack_base, current_l1_stack_save, l1_stack_len);
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
#ifdef CONFIG_MPU
static inline void protect_page(struct mm_struct *mm, unsigned long addr,
unsigned long flags)
{
activate_mm(prev, next);
unsigned long *mask = mm->context.page_rwx_mask;
unsigned long page = addr >> 12;
unsigned long idx = page >> 5;
unsigned long bit = 1 << (page & 31);
if (flags & VM_MAYREAD)
mask[idx] |= bit;
else
mask[idx] &= ~bit;
mask += page_mask_nelts;
if (flags & VM_MAYWRITE)
mask[idx] |= bit;
else
mask[idx] &= ~bit;
mask += page_mask_nelts;
if (flags & VM_MAYEXEC)
mask[idx] |= bit;
else
mask[idx] &= ~bit;
}
static inline void update_protections(struct mm_struct *mm)
{
flush_switched_cplbs();
set_mask_dcplbs(mm->context.page_rwx_mask);
}
#endif
#endif