romvec.pvtime is a pointer to an 'uptime' counter, calibrated in
millisecond.
We use the [1st] CPU timer, running at 100Hz, to increment (+10) the
counter.
This counter is used by NextStep to measure the 10 seconds delay during
boot, when asking
about boot options.
Signed-off-by: Olivier Danet <odanet(a)caramail.com>
---------------------------------------------------------------
diff a/arch/sparc32/romvec.c b/arch/sparc32/romvec.c
--- a/arch/sparc32/romvec.c 2014-02-07 18:23:59.761220839 +0100
+++ b/arch/sparc32/romvec.c 2014-02-07 18:39:38.728186578 +0100
@@ -479,6 +479,7 @@ init_openprom(void)
romvec0.pv_reboot = obp_reboot_handler;
romvec0.pv_printf = obp_printf_handler;
romvec0.pv_abort = obp_abort_handler;
+ romvec0.pv_ticks = &obp_ticks;
romvec0.pv_halt = obp_halt_handler;
romvec0.pv_synchook = &sync_hook;
romvec0.pv_v0bootargs = &obp_argp;
diff -rup a/arch/sparc32/vectors.S b/arch/sparc32/vectors.S
--- a/arch/sparc32/vectors.S 2014-02-07 18:22:20.063224477 +0100
+++ b/arch/sparc32/vectors.S 2014-02-07 18:40:44.161184191 +0100
@@ -207,6 +207,10 @@ irq_entry14:
sethi %hi(counter_regs), %l7
ld [%l7 + %lo(counter_regs)], %l7
ld [%l7], %g0
+ sethi %hi(obp_ticks), %l7
+ ld [%l7 + %lo(obp_ticks)], %l6
+ add %l6, 10, %l6
+ st %l6, [%l7 + %lo(obp_ticks)]
jmp %l1
rett %l2
diff a/drivers/obio.c b/drivers/obio.c
--- a/drivers/obio.c 2014-02-07 18:25:08.050218348 +0100
+++ b/drivers/obio.c 2014-02-07 18:56:54.126148798 +0100
@@ -253,6 +253,8 @@ ob_aux2_reset_init(uint64_t base, uint64
volatile struct sun4m_timer_regs *counter_regs;
+volatile int32_t obp_ticks;
+
static void
ob_counter_init(uint64_t base, unsigned long offset, int ncpu)
{
@@ -287,7 +289,7 @@ ob_counter_init(uint64_t base, unsigned
counter_regs = (struct sun4m_timer_regs *)ofmem_map_io(base +
(uint64_t)offset, sizeof(*counter_regs));
- counter_regs->cfg = 0xffffffff;
+ counter_regs->cfg = 0xfffffffe;
counter_regs->l10_timer_limit = 0;
counter_regs->cpu_timers[0].l14_timer_limit = 0x9c4000; /* see
comment in obio.h */
counter_regs->cpu_timers[0].cntrl = 1;
@@ -304,6 +306,8 @@ ob_counter_init(uint64_t base, unsigned
push_str("address");
fword("property");
+ obp_ticks = 0;
+
fword("finish-device");
}
diff a/drivers/obio.h b/drivers/obio.h
--- a/drivers/obio.h 2014-02-07 18:22:20.276224469 +0100
+++ b/drivers/obio.h 2014-02-07 18:45:46.417173162 +0100
@@ -88,7 +88,7 @@ struct sun4m_timer_regs {
* Registers of hardware timer in sun4m.
*/
struct sun4m_timer_percpu {
- volatile unsigned int l14_timer_limit; /* Initial value is
0x009c4000 */
+ volatile unsigned int l14_timer_limit; /* Initial value is
0x009c4000 = 10ms period*/
volatile unsigned int l14_cur_count;
};
diff a/include/drivers/drivers.h b/include/drivers/drivers.h
--- a/include/drivers/drivers.h 2014-02-07 18:25:08.053218348 +0100
+++ b/include/drivers/drivers.h 2014-02-07 18:43:25.598178300 +0100
@@ -81,6 +81,7 @@ extern uint16_t graphic_depth;
extern volatile unsigned char *power_reg;
extern volatile unsigned int *reset_reg;
extern volatile struct sun4m_timer_regs *counter_regs;
+extern volatile int32_t obp_ticks;
void ob_new_obio_device(const char *name, const char *type);
unsigned long ob_reg(uint64_t base, uint64_t offset, unsigned long
size, int map);
---------------------------------------------------------------