summaryrefslogtreecommitdiffstats
path: root/arch/avr32/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/avr32/kernel')
-rw-r--r--arch/avr32/kernel/.gitignore1
-rw-r--r--arch/avr32/kernel/asm-offsets.c6
-rw-r--r--arch/avr32/kernel/avr32_ksyms.c1
-rw-r--r--arch/avr32/kernel/entry-avr32b.S59
-rw-r--r--arch/avr32/kernel/process.c3
-rw-r--r--arch/avr32/kernel/setup.c19
-rw-r--r--arch/avr32/kernel/syscall-stubs.S9
-rw-r--r--arch/avr32/kernel/syscall_table.S2
-rw-r--r--arch/avr32/kernel/traps.c8
9 files changed, 100 insertions, 8 deletions
diff --git a/arch/avr32/kernel/.gitignore b/arch/avr32/kernel/.gitignore
new file mode 100644
index 000000000000..c5f676c3c224
--- /dev/null
+++ b/arch/avr32/kernel/.gitignore
@@ -0,0 +1 @@
+vmlinux.lds
diff --git a/arch/avr32/kernel/asm-offsets.c b/arch/avr32/kernel/asm-offsets.c
index e4796c67a831..d6a8193a1d2f 100644
--- a/arch/avr32/kernel/asm-offsets.c
+++ b/arch/avr32/kernel/asm-offsets.c
@@ -4,6 +4,8 @@
* to extract and format the required data.
*/
+#include <linux/mm.h>
+#include <linux/sched.h>
#include <linux/thread_info.h>
#include <linux/kbuild.h>
@@ -17,4 +19,8 @@ void foo(void)
OFFSET(TI_rar_saved, thread_info, rar_saved);
OFFSET(TI_rsr_saved, thread_info, rsr_saved);
OFFSET(TI_restart_block, thread_info, restart_block);
+ BLANK();
+ OFFSET(TSK_active_mm, task_struct, active_mm);
+ BLANK();
+ OFFSET(MM_pgd, mm_struct, pgd);
}
diff --git a/arch/avr32/kernel/avr32_ksyms.c b/arch/avr32/kernel/avr32_ksyms.c
index 84a7d44edc67..11e310c567a9 100644
--- a/arch/avr32/kernel/avr32_ksyms.c
+++ b/arch/avr32/kernel/avr32_ksyms.c
@@ -58,6 +58,7 @@ EXPORT_SYMBOL(find_first_zero_bit);
EXPORT_SYMBOL(find_next_zero_bit);
EXPORT_SYMBOL(find_first_bit);
EXPORT_SYMBOL(find_next_bit);
+EXPORT_SYMBOL(generic_find_next_le_bit);
EXPORT_SYMBOL(generic_find_next_zero_le_bit);
/* I/O primitives (lib/io-*.S) */
diff --git a/arch/avr32/kernel/entry-avr32b.S b/arch/avr32/kernel/entry-avr32b.S
index 2b398cae110c..33d49377b8be 100644
--- a/arch/avr32/kernel/entry-avr32b.S
+++ b/arch/avr32/kernel/entry-avr32b.S
@@ -334,9 +334,64 @@ save_full_context_ex:
/* Low-level exception handlers */
handle_critical:
+ /*
+ * AT32AP700x errata:
+ *
+ * After a Java stack overflow or underflow trap, any CPU
+ * memory access may cause erratic behavior. This will happen
+ * when the four least significant bits of the JOSP system
+ * register contains any value between 9 and 15 (inclusive).
+ *
+ * Possible workarounds:
+ * - Don't use the Java Extension Module
+ * - Ensure that the stack overflow and underflow trap
+ * handlers do not do any memory access or trigger any
+ * exceptions before the overflow/underflow condition is
+ * cleared (by incrementing or decrementing the JOSP)
+ * - Make sure that JOSP does not contain any problematic
+ * value before doing any exception or interrupt
+ * processing.
+ * - Set up a critical exception handler which writes a
+ * known-to-be-safe value, e.g. 4, to JOSP before doing
+ * any further processing.
+ *
+ * We'll use the last workaround for now since we cannot
+ * guarantee that user space processes don't use Java mode.
+ * Non-well-behaving userland will be terminated with extreme
+ * prejudice.
+ */
+#ifdef CONFIG_CPU_AT32AP700X
+ /*
+ * There's a chance we can't touch memory, so temporarily
+ * borrow PTBR to save the stack pointer while we fix things
+ * up...
+ */
+ mtsr SYSREG_PTBR, sp
+ mov sp, 4
+ mtsr SYSREG_JOSP, sp
+ mfsr sp, SYSREG_PTBR
+ sub pc, -2
+
+ /* Push most of pt_regs on stack. We'll do the rest later */
sub sp, 4
- stmts --sp, r0-lr
- rcall save_full_context_ex
+ pushm r0-r12
+
+ /* PTBR mirrors current_thread_info()->task->active_mm->pgd */
+ get_thread_info r0
+ ld.w r1, r0[TI_task]
+ ld.w r2, r1[TSK_active_mm]
+ ld.w r3, r2[MM_pgd]
+ mtsr SYSREG_PTBR, r3
+#else
+ sub sp, 4
+ pushm r0-r12
+#endif
+ sub r0, sp, -(14 * 4)
+ mov r1, lr
+ mfsr r2, SYSREG_RAR_EX
+ mfsr r3, SYSREG_RSR_EX
+ pushm r0-r3
+
mfsr r12, SYSREG_ECR
mov r11, sp
rcall do_critical_exception
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 2c08ac992ac3..134d5302b6dd 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
+#include <linux/pm.h>
#include <linux/ptrace.h>
#include <linux/reboot.h>
#include <linux/tick.h>
@@ -20,7 +21,7 @@
#include <mach/pm.h>
-void (*pm_power_off)(void) = NULL;
+void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
/*
diff --git a/arch/avr32/kernel/setup.c b/arch/avr32/kernel/setup.c
index d8e623c426c1..5c7083916c33 100644
--- a/arch/avr32/kernel/setup.c
+++ b/arch/avr32/kernel/setup.c
@@ -283,6 +283,25 @@ static int __init early_parse_fbmem(char *p)
}
early_param("fbmem", early_parse_fbmem);
+/*
+ * Pick out the memory size. We look for mem=size@start,
+ * where start and size are "size[KkMmGg]"
+ */
+static int __init early_mem(char *p)
+{
+ resource_size_t size, start;
+
+ start = system_ram->start;
+ size = memparse(p, &p);
+ if (*p == '@')
+ start = memparse(p + 1, &p);
+
+ system_ram->start = start;
+ system_ram->end = system_ram->start + size - 1;
+ return 0;
+}
+early_param("mem", early_mem);
+
static int __init parse_tag_core(struct tag *tag)
{
if (tag->hdr.size > 2) {
diff --git a/arch/avr32/kernel/syscall-stubs.S b/arch/avr32/kernel/syscall-stubs.S
index 890286a1e62b..673178e235f3 100644
--- a/arch/avr32/kernel/syscall-stubs.S
+++ b/arch/avr32/kernel/syscall-stubs.S
@@ -109,3 +109,12 @@ __sys_epoll_pwait:
rcall sys_epoll_pwait
sub sp, -4
popm pc
+
+ .global __sys_sync_file_range
+ .type __sys_sync_file_range,@function
+__sys_sync_file_range:
+ pushm lr
+ st.w --sp, ARG6
+ rcall sys_sync_file_range
+ sub sp, -4
+ popm pc
diff --git a/arch/avr32/kernel/syscall_table.S b/arch/avr32/kernel/syscall_table.S
index 478bda4c4a09..7ee0057613b3 100644
--- a/arch/avr32/kernel/syscall_table.S
+++ b/arch/avr32/kernel/syscall_table.S
@@ -275,7 +275,7 @@ sys_call_table:
.long sys_set_robust_list
.long sys_get_robust_list /* 260 */
.long __sys_splice
- .long sys_sync_file_range
+ .long __sys_sync_file_range
.long sys_tee
.long sys_vmsplice
.long __sys_epoll_pwait /* 265 */
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index b835c4c01368..0d987373bc01 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -116,15 +116,15 @@ asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
switch (ret) {
case NOTIFY_OK:
case NOTIFY_STOP:
- return;
+ break;
case NOTIFY_BAD:
die("Fatal Non-Maskable Interrupt", regs, SIGINT);
default:
+ printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n");
+ nmi_disable();
break;
}
-
- printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n");
- nmi_disable();
+ nmi_exit();
}
asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
OpenPOWER on IntegriCloud