More AP / SP bits for the 34K, the Malta bits and things. Still wants
a little polishing.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index b2fa607..0a3969a 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -20,6 +20,7 @@
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
+#include <linux/bootmem.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -64,6 +65,9 @@
void (*board_be_init)(void);
int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
+void (*board_nmi_handler_setup)(void);
+void (*board_ejtag_handler_setup)(void);
+void (*board_bind_eic_interrupt)(int irq, int regset);
/*
* These constant is for searching for possible module text segments.
@@ -813,6 +817,12 @@
(regs->cp0_cause & 0x7f) >> 2);
}
+asmlinkage void do_default_vi(struct pt_regs *regs)
+{
+ show_regs(regs);
+ panic("Caught unexpected vectored interrupt.");
+}
+
/*
* Some MIPS CPUs can enable/disable for cache parity detection, but do
* it different ways.
@@ -921,7 +931,11 @@
while(1) ;
}
+#define VECTORSPACING 0x100 /* for EI/VI mode */
+
+unsigned long ebase;
unsigned long exception_handlers[32];
+unsigned long vi_handlers[64];
/*
* As a side effect of the way this is implemented we're limited
@@ -935,13 +949,156 @@
exception_handlers[n] = handler;
if (n == 0 && cpu_has_divec) {
- *(volatile u32 *)(CAC_BASE + 0x200) = 0x08000000 |
+ *(volatile u32 *)(ebase + 0x200) = 0x08000000 |
(0x03ffffff & (handler >> 2));
- flush_icache_range(CAC_BASE + 0x200, CAC_BASE + 0x204);
+ flush_icache_range(ebase + 0x200, ebase + 0x204);
}
return (void *)old_handler;
}
+#ifdef CONFIG_CPU_MIPSR2
+/*
+ * Shadow register allocation
+ * FIXME: SMP...
+ */
+
+/* MIPSR2 shadow register sets */
+struct shadow_registers {
+ spinlock_t sr_lock; /* */
+ int sr_supported; /* Number of shadow register sets supported */
+ int sr_allocated; /* Bitmap of allocated shadow registers */
+} shadow_registers;
+
+void mips_srs_init(void)
+{
+#ifdef CONFIG_CPU_MIPSR2_SRS
+ shadow_registers.sr_supported = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
+ printk ("%d MIPSR2 register sets available\n", shadow_registers.sr_supported);
+#else
+ shadow_registers.sr_supported = 1;
+#endif
+ shadow_registers.sr_allocated = 1; /* Set 0 used by kernel */
+ spin_lock_init(&shadow_registers.sr_lock);
+}
+
+int mips_srs_max(void)
+{
+ return shadow_registers.sr_supported;
+}
+
+int mips_srs_alloc (void)
+{
+ struct shadow_registers *sr = &shadow_registers;
+ unsigned long flags;
+ int set;
+
+ spin_lock_irqsave(&sr->sr_lock, flags);
+
+ for (set = 0; set < sr->sr_supported; set++) {
+ if ((sr->sr_allocated & (1 << set)) == 0) {
+ sr->sr_allocated |= 1 << set;
+ spin_unlock_irqrestore(&sr->sr_lock, flags);
+ return set;
+ }
+ }
+
+ /* None available */
+ spin_unlock_irqrestore(&sr->sr_lock, flags);
+ return -1;
+}
+
+void mips_srs_free (int set)
+{
+ struct shadow_registers *sr = &shadow_registers;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sr->sr_lock, flags);
+ sr->sr_allocated &= ~(1 << set);
+ spin_unlock_irqrestore(&sr->sr_lock, flags);
+}
+
+void *set_vi_srs_handler (int n, void *addr, int srs)
+{
+ unsigned long handler;
+ unsigned long old_handler = vi_handlers[n];
+ u32 *w;
+ unsigned char *b;
+
+ if (!cpu_has_veic && !cpu_has_vint)
+ BUG();
+
+ if (addr == NULL) {
+ handler = (unsigned long) do_default_vi;
+ srs = 0;
+ }
+ else
+ handler = (unsigned long) addr;
+ vi_handlers[n] = (unsigned long) addr;
+
+ b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING);
+
+ if (srs >= mips_srs_max())
+ panic("Shadow register set %d not supported", srs);
+
+ if (cpu_has_veic) {
+ if (board_bind_eic_interrupt)
+ board_bind_eic_interrupt (n, srs);
+ }
+ else if (cpu_has_vint) {
+ /* SRSMap is only defined if shadow sets are implemented */
+ if (mips_srs_max() > 1)
+ change_c0_srsmap (0xf << n*4, srs << n*4);
+ }
+
+ if (srs == 0) {
+ /*
+ * If no shadow set is selected then use the default handler
+ * that does normal register saving and a standard interrupt exit
+ */
+
+ extern char except_vec_vi, except_vec_vi_lui;
+ extern char except_vec_vi_ori, except_vec_vi_end;
+ const int handler_len = &except_vec_vi_end - &except_vec_vi;
+ const int lui_offset = &except_vec_vi_lui - &except_vec_vi;
+ const int ori_offset = &except_vec_vi_ori - &except_vec_vi;
+
+ if (handler_len > VECTORSPACING) {
+ /*
+ * Sigh... panicing won't help as the console
+ * is probably not configured :(
+ */
+ panic ("VECTORSPACING too small");
+ }
+
+ memcpy (b, &except_vec_vi, handler_len);
+ w = (u32 *)(b + lui_offset);
+ *w = (*w & 0xffff0000) | (((u32)handler >> 16) & 0xffff);
+ w = (u32 *)(b + ori_offset);
+ *w = (*w & 0xffff0000) | ((u32)handler & 0xffff);
+ flush_icache_range((unsigned long)b, (unsigned long)(b+handler_len));
+ }
+ else {
+ /*
+ * In other cases jump directly to the interrupt handler
+ *
+ * It is the handlers responsibility to save registers if required
+ * (eg hi/lo) and return from the exception using "eret"
+ */
+ w = (u32 *)b;
+ *w++ = 0x08000000 | (((u32)handler >> 2) & 0x03fffff); /* j handler */
+ *w = 0;
+ flush_icache_range((unsigned long)b, (unsigned long)(b+8));
+ }
+
+ return (void *)old_handler;
+}
+
+void *set_vi_handler (int n, void *addr)
+{
+ return set_vi_srs_handler (n, addr, 0);
+}
+#endif
+
/*
* This is used by native signal handling
*/
@@ -1016,10 +1173,18 @@
if (cpu_has_dsp)
set_c0_status(ST0_MX);
+#ifdef CONFIG_CPU_MIPSR2
+ write_c0_hwrena (0x0000000f); /* Allow rdhwr to all registers */
+#endif
+
/*
- * Some MIPS CPUs have a dedicated interrupt vector which reduces the
- * interrupt processing overhead. Use it where available.
+ * Interrupt handling.
*/
+ if (cpu_has_veic || cpu_has_vint) {
+ write_c0_ebase (ebase);
+ /* Setting vector spacing enables EI/VI mode */
+ change_c0_intctl (0x3e0, VECTORSPACING);
+ }
if (cpu_has_divec)
set_c0_cause(CAUSEF_IV);
@@ -1035,13 +1200,41 @@
tlb_init();
}
+/* Install CPU exception handler */
+void __init set_handler (unsigned long offset, void *addr, unsigned long size)
+{
+ memcpy((void *)(ebase + offset), addr, size);
+ flush_icache_range(ebase + offset, ebase + offset + size);
+}
+
+/* Install uncached CPU exception handler */
+void __init set_uncached_handler (unsigned long offset, void *addr, unsigned long size)
+{
+#ifdef CONFIG_32BIT
+ unsigned long uncached_ebase = KSEG1ADDR(ebase);
+#endif
+#ifdef CONFIG_64BIT
+ unsigned long uncached_ebase = TO_UNCAC(ebase);
+#endif
+
+ memcpy((void *)(uncached_ebase + offset), addr, size);
+}
+
void __init trap_init(void)
{
extern char except_vec3_generic, except_vec3_r4000;
- extern char except_vec_ejtag_debug;
extern char except_vec4;
unsigned long i;
+ if (cpu_has_veic || cpu_has_vint)
+ ebase = (unsigned long) alloc_bootmem_low_pages (0x200 + VECTORSPACING*64);
+ else
+ ebase = CAC_BASE;
+
+#ifdef CONFIG_CPU_MIPSR2
+ mips_srs_init();
+#endif
+
per_cpu_trap_init();
/*
@@ -1049,7 +1242,7 @@
* This will be overriden later as suitable for a particular
* configuration.
*/
- memcpy((void *)(CAC_BASE + 0x180), &except_vec3_generic, 0x80);
+ set_handler(0x180, &except_vec3_generic, 0x80);
/*
* Setup default vectors
@@ -1061,8 +1254,8 @@
* Copy the EJTAG debug exception vector handler code to it's final
* destination.
*/
- if (cpu_has_ejtag)
- memcpy((void *)(CAC_BASE + 0x300), &except_vec_ejtag_debug, 0x80);
+ if (cpu_has_ejtag && board_ejtag_handler_setup)
+ board_ejtag_handler_setup ();
/*
* Only some CPUs have the watch exceptions.
@@ -1071,11 +1264,15 @@
set_except_vector(23, handle_watch);
/*
- * Some MIPS CPUs have a dedicated interrupt vector which reduces the
- * interrupt processing overhead. Use it where available.
+ * Initialise interrupt handlers
*/
- if (cpu_has_divec)
- memcpy((void *)(CAC_BASE + 0x200), &except_vec4, 0x8);
+ if (cpu_has_veic || cpu_has_vint) {
+ int nvec = cpu_has_veic ? 64 : 8;
+ for (i = 0; i < nvec; i++)
+ set_vi_handler (i, NULL);
+ }
+ else if (cpu_has_divec)
+ set_handler(0x200, &except_vec4, 0x8);
/*
* Some CPUs can enable/disable for cache parity detection, but does
@@ -1122,6 +1319,10 @@
//set_except_vector(15, handle_ndc);
}
+
+ if (board_nmi_handler_setup)
+ board_nmi_handler_setup();
+
if (cpu_has_fpu && !cpu_has_nofpuex)
set_except_vector(15, handle_fpe);
@@ -1146,5 +1347,5 @@
signal32_init();
#endif
- flush_icache_range(CAC_BASE, CAC_BASE + 0x400);
+ flush_icache_range(ebase, ebase + 0x400);
}
