Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/arm26/kernel/fiq.c b/arch/arm26/kernel/fiq.c
new file mode 100644
index 0000000..08a97c9
--- /dev/null
+++ b/arch/arm26/kernel/fiq.c
@@ -0,0 +1,202 @@
+/*
+ * linux/arch/arm26/kernel/fiq.c
+ *
+ * Copyright (C) 1998 Russell King
+ * Copyright (C) 1998, 1999 Phil Blundell
+ * Copyright (C) 2003 Ian Molton
+ *
+ * FIQ support written by Philip Blundell <philb@gnu.org>, 1998.
+ *
+ * FIQ support re-written by Russell King to be more generic
+ *
+ * We now properly support a method by which the FIQ handlers can
+ * be stacked onto the vector. We still do not support sharing
+ * the FIQ vector itself.
+ *
+ * Operation is as follows:
+ * 1. Owner A claims FIQ:
+ * - default_fiq relinquishes control.
+ * 2. Owner A:
+ * - inserts code.
+ * - sets any registers,
+ * - enables FIQ.
+ * 3. Owner B claims FIQ:
+ * - if owner A has a relinquish function.
+ * - disable FIQs.
+ * - saves any registers.
+ * - returns zero.
+ * 4. Owner B:
+ * - inserts code.
+ * - sets any registers,
+ * - enables FIQ.
+ * 5. Owner B releases FIQ:
+ * - Owner A is asked to reacquire FIQ:
+ * - inserts code.
+ * - restores saved registers.
+ * - enables FIQ.
+ * 6. Goto 3
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+
+#include <asm/fiq.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/pgalloc.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#define FIQ_VECTOR (vectors_base() + 0x1c)
+
+static unsigned long no_fiq_insn;
+
+#define unprotect_page_0()
+#define protect_page_0()
+
+/* Default reacquire function
+ * - we always relinquish FIQ control
+ * - we always reacquire FIQ control
+ */
+static int fiq_def_op(void *ref, int relinquish)
+{
+ if (!relinquish) {
+ unprotect_page_0();
+ *(unsigned long *)FIQ_VECTOR = no_fiq_insn;
+ protect_page_0();
+ }
+
+ return 0;
+}
+
+static struct fiq_handler default_owner = {
+ .name = "default",
+ .fiq_op = fiq_def_op,
+};
+
+static struct fiq_handler *current_fiq = &default_owner;
+
+int show_fiq_list(struct seq_file *p, void *v)
+{
+ if (current_fiq != &default_owner)
+ seq_printf(p, "FIQ: %s\n", current_fiq->name);
+
+ return 0;
+}
+
+void set_fiq_handler(void *start, unsigned int length)
+{
+ unprotect_page_0();
+
+ memcpy((void *)FIQ_VECTOR, start, length);
+
+ protect_page_0();
+}
+
+/*
+ * Taking an interrupt in FIQ mode is death, so both these functions
+ * disable irqs for the duration.
+ */
+void set_fiq_regs(struct pt_regs *regs)
+{
+ register unsigned long tmp, tmp2;
+ __asm__ volatile (
+ "mov %0, pc
+ bic %1, %0, #0x3
+ orr %1, %1, %3
+ teqp %1, #0 @ select FIQ mode
+ mov r0, r0
+ ldmia %2, {r8 - r14}
+ teqp %0, #0 @ return to SVC mode
+ mov r0, r0"
+ : "=&r" (tmp), "=&r" (tmp2)
+ : "r" (®s->ARM_r8), "I" (PSR_I_BIT | PSR_F_BIT | MODE_FIQ26)
+ /* These registers aren't modified by the above code in a way
+ visible to the compiler, but we mark them as clobbers anyway
+ so that GCC won't put any of the input or output operands in
+ them. */
+ : "r8", "r9", "r10", "r11", "r12", "r13", "r14");
+}
+
+void get_fiq_regs(struct pt_regs *regs)
+{
+ register unsigned long tmp, tmp2;
+ __asm__ volatile (
+ "mov %0, pc
+ bic %1, %0, #0x3
+ orr %1, %1, %3
+ teqp %1, #0 @ select FIQ mode
+ mov r0, r0
+ stmia %2, {r8 - r14}
+ teqp %0, #0 @ return to SVC mode
+ mov r0, r0"
+ : "=&r" (tmp), "=&r" (tmp2)
+ : "r" (®s->ARM_r8), "I" (PSR_I_BIT | PSR_F_BIT | MODE_FIQ26)
+ /* These registers aren't modified by the above code in a way
+ visible to the compiler, but we mark them as clobbers anyway
+ so that GCC won't put any of the input or output operands in
+ them. */
+ : "r8", "r9", "r10", "r11", "r12", "r13", "r14");
+}
+
+int claim_fiq(struct fiq_handler *f)
+{
+ int ret = 0;
+
+ if (current_fiq) {
+ ret = -EBUSY;
+
+ if (current_fiq->fiq_op != NULL)
+ ret = current_fiq->fiq_op(current_fiq->dev_id, 1);
+ }
+
+ if (!ret) {
+ f->next = current_fiq;
+ current_fiq = f;
+ }
+
+ return ret;
+}
+
+void release_fiq(struct fiq_handler *f)
+{
+ if (current_fiq != f) {
+ printk(KERN_ERR "%s FIQ trying to release %s FIQ\n",
+ f->name, current_fiq->name);
+#ifdef CONFIG_DEBUG_ERRORS
+ __backtrace();
+#endif
+ return;
+ }
+
+ do
+ current_fiq = current_fiq->next;
+ while (current_fiq->fiq_op(current_fiq->dev_id, 0));
+}
+
+void enable_fiq(int fiq)
+{
+ enable_irq(fiq + FIQ_START);
+}
+
+void disable_fiq(int fiq)
+{
+ disable_irq(fiq + FIQ_START);
+}
+
+EXPORT_SYMBOL(set_fiq_handler);
+EXPORT_SYMBOL(set_fiq_regs);
+EXPORT_SYMBOL(get_fiq_regs);
+EXPORT_SYMBOL(claim_fiq);
+EXPORT_SYMBOL(release_fiq);
+EXPORT_SYMBOL(enable_fiq);
+EXPORT_SYMBOL(disable_fiq);
+
+void __init init_FIQ(void)
+{
+ no_fiq_insn = *(unsigned long *)FIQ_VECTOR;
+ set_fs(get_fs());
+}