diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/go32/clock/ckinit.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/go32/clock/ckinit.c | 182 |
1 files changed, 127 insertions, 55 deletions
diff --git a/c/src/lib/libbsp/i386/go32/clock/ckinit.c b/c/src/lib/libbsp/i386/go32/clock/ckinit.c index 5ac1c10d98..fa6a8bf057 100644 --- a/c/src/lib/libbsp/i386/go32/clock/ckinit.c +++ b/c/src/lib/libbsp/i386/go32/clock/ckinit.c @@ -11,67 +11,81 @@ */ #include <bsp.h> -#include <clockdrv.h> +#include <rtems/libio.h> + #include <stdlib.h> volatile rtems_unsigned32 Clock_driver_ticks; -rtems_unsigned32 Clock_isrs_per_tick; /* ISRs per tick */ -rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ +rtems_unsigned32 Clock_isrs_per_tick; /* ISRs per tick */ +rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ rtems_isr_entry Old_ticker; -rtems_device_driver Clock_initialize( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *pargp, - rtems_id tid, - rtems_unsigned32 *rval -) -{ - Install_clock( Clock_isr ); -} +#define CLOCK_VECTOR 0x8 -void ReInstall_clock( - rtems_isr_entry clock_isr +void Clock_exit( void ); + +/* + * These are set by clock driver during its init + */ + +rtems_device_major_number rtems_clock_major = ~0; +rtems_device_minor_number rtems_clock_minor; + +rtems_isr Clock_isr( + rtems_vector_number vector ) { - rtems_unsigned32 isrlevel = 0; + /* touch interrupt controller for irq0 (0x20+0) */ + outport_byte( 0x20, 0x20 ); - rtems_interrupt_disable( isrlevel ); - (void) set_vector( clock_isr, 0x8, 1 ); - rtems_interrupt_enable( isrlevel ); + Clock_driver_ticks += 1; + +#if 0 && defined(pentium) + { + extern long long Last_RDTSC; + __asm __volatile( ".byte 0x0F, 0x31" : "=A" (Last_RDTSC) ); + } +#endif + + if ( Clock_isrs == 1 ) { + rtems_clock_tick(); + Clock_isrs = Clock_isrs_per_tick; + } else { + Clock_isrs -= 1; + } } void Install_clock( rtems_isr_entry clock_isr ) { - unsigned int microseconds_per_isr; + unsigned int microseconds_per_isr; #if 0 - /* Initialize clock from on-board real time clock. This breaks the */ + /* Initialize clock from on-board real time clock. This breaks the */ /* test code which assumes which assumes the application will do it. */ { - rtems_time_of_day Now; - extern void init_rtc( void ); - extern long rtc_read( rtems_time_of_day * tod ); - init_rtc(); - if ( rtc_read( &Now ) >= 0 ) - clock_set( &Now ); - } + rtems_time_of_day Now; + extern void init_rtc( void ); + extern long rtc_read( rtems_time_of_day * tod ); + init_rtc(); + if ( rtc_read( &Now ) >= 0 ) + clock_set( &Now ); + } #endif - /* Start by assuming hardware counter is large enough, then */ - /* scale it until it actually fits. */ + /* Start by assuming hardware counter is large enough, then */ + /* scale it until it actually fits. */ Clock_driver_ticks = 0; Clock_isrs_per_tick = 1; if ( BSP_Configuration.microseconds_per_tick == 0 ) - microseconds_per_isr = 10000; /* default 10 ms */ + microseconds_per_isr = 10000; /* default 10 ms */ else - microseconds_per_isr = BSP_Configuration.microseconds_per_tick; + microseconds_per_isr = BSP_Configuration.microseconds_per_tick; while ( US_TO_TICK(microseconds_per_isr) > 65535 ) { - Clock_isrs_per_tick *= 10; - microseconds_per_isr /= 10; + Clock_isrs_per_tick *= 10; + microseconds_per_isr /= 10; } /* Initialize count in ckisr.c */ @@ -83,43 +97,101 @@ void Install_clock( #endif if ( BSP_Configuration.ticks_per_timeslice ) { - /* 105/88 approximates TIMER_TICK*1e-6 */ - unsigned int count = US_TO_TICK( microseconds_per_isr ); + /* 105/88 approximates TIMER_TICK*1e-6 */ + unsigned int count = US_TO_TICK( microseconds_per_isr ); - Old_ticker = (rtems_isr_entry) set_vector( clock_isr, 0x8, 1 ); - outport_byte( TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN ); - outport_byte( TIMER_CNTR0, count >> 0 & 0xff ); - outport_byte( TIMER_CNTR0, count >> 8 & 0xff ); + Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); + outport_byte( TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN ); + outport_byte( TIMER_CNTR0, count >> 0 & 0xff ); + outport_byte( TIMER_CNTR0, count >> 8 & 0xff ); } atexit( Clock_exit ); } +void ReInstall_clock( + rtems_isr_entry clock_isr +) +{ + rtems_unsigned32 isrlevel = 0; + + rtems_interrupt_disable( isrlevel ); + (void) set_vector( clock_isr, CLOCK_VECTOR, 1 ); + rtems_interrupt_enable( isrlevel ); +} + void Clock_exit( void ) { if ( BSP_Configuration.ticks_per_timeslice ) { - extern void rtc_set_dos_date( void ); - - /* reset to DOS value: */ - outport_byte( TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN ); - outport_byte( TIMER_CNTR0, 0 ); - outport_byte( TIMER_CNTR0, 0 ); - - /* reset time-of-day */ - rtc_set_dos_date(); - - /* re-enable old handler: assume it was one of ours */ - set_vector( (rtems_isr_entry)Old_ticker, 0x8, 1 ); + extern void rtc_set_dos_date( void ); + + /* reset to DOS value: */ + outport_byte( TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN ); + outport_byte( TIMER_CNTR0, 0 ); + outport_byte( TIMER_CNTR0, 0 ); + + /* reset time-of-day */ + rtc_set_dos_date(); + + /* re-enable old handler: assume it was one of ours */ + set_vector( (rtems_isr_entry)Old_ticker, CLOCK_VECTOR, 1 ); } } +rtems_device_driver Clock_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + Install_clock( Clock_isr ); + + /* + * make major/minor avail to others such as shared memory driver + */ + + rtems_clock_major = major; + rtems_clock_minor = minor; + + return RTEMS_SUCCESSFUL; +} + +rtems_device_driver Clock_control( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + rtems_libio_ioctl_args_t *args = pargp; + + if (args == 0) + goto done; + + /* + * This is hokey, but until we get a defined interface + * to do this, it will just be this simple... + */ + + if (args->command == rtems_build_name('I', 'S', 'R', ' ')) + { + Clock_isr(CLOCK_VECTOR); + } + else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) + { + ReInstall_clock(args->buffer); + } + +done: + return RTEMS_SUCCESSFUL; +} #if 0 && defined(pentium) -/* This can be used to get extremely accurate timing on a pentium. */ -/* It isn't supported. [bryce] */ +/* This can be used to get extremely accurate timing on a pentium. */ +/* It isn't supported. [bryce] */ #define HZ 90.0 volatile long long Last_RDTSC; #define RDTSC()\ ({ long long _now; __asm __volatile (".byte 0x0F,0x31":"=A"(_now)); _now; }) + long long Kernel_Time_ns( void ) { extern rtems_unsigned32 _TOD_Ticks_per_second; @@ -128,7 +200,7 @@ long long Kernel_Time_ns( void ) int flags; disable_intr( flags ); now = 1e9 * Clock_driver_ticks / isrs_per_second - + (RDTSC() - Last_RDTSC) * (1000.0/HZ); + + (RDTSC() - Last_RDTSC) * (1000.0/HZ); enable_intr( flags ); return now; } |