source: rtems/c/src/lib/libbsp/sparc/leon3/smp/smp_leon3.c @ 1c1c2a0

4.11
Last change on this file since 1c1c2a0 was 1c1c2a0, checked in by Sebastian Huber <sebastian.huber@…>, on Feb 5, 2014 at 2:27:22 PM

bsps: Delete unused bsp_smp_delay()

  • Property mode set to 100644
File size: 2.4 KB
Line 
1/**
2 * @file
3 * @ingroup sparc_leon3
4 * @brief LEON3 SMP BSP Support
5 */
6
7/*
8 *  COPYRIGHT (c) 1989-2011.
9 *  On-Line Applications Research Corporation (OAR).
10 *
11 *  The license and distribution terms for this file may be
12 *  found in the file LICENSE in this distribution or at
13 *  http://www.rtems.com/license/LICENSE.
14 */
15
16#include <bsp.h>
17#include <leon.h>
18#include <rtems/bspIo.h>
19#include <rtems/bspsmp.h>
20#include <stdlib.h>
21
22#define RTEMS_DEBUG
23
24static inline void sparc_leon3_set_cctrl( unsigned int val )
25{
26  __asm__ volatile( "sta %0, [%%g0] 2" : : "r" (val) );
27}
28
29static inline unsigned int sparc_leon3_get_cctrl( void )
30{
31  unsigned int v = 0;
32  __asm__ volatile( "lda [%%g0] 2, %0" : "=r" (v) : "0" (v) );
33  return v;
34}
35
36static rtems_isr bsp_ap_ipi_isr(
37  rtems_vector_number vector
38)
39{
40  rtems_smp_process_interrupt();
41}
42
43void leon3_secondary_cpu_initialize(uint32_t cpu)
44{
45  sparc_leon3_set_cctrl( 0x80000F );
46  LEON_Unmask_interrupt(LEON3_MP_IRQ);
47  LEON3_IrqCtrl_Regs->mask[cpu] |= 1 << LEON3_MP_IRQ;
48
49  rtems_smp_secondary_cpu_initialize();
50}
51
52uint32_t bsp_smp_initialize( uint32_t configured_cpu_count )
53{
54  uint32_t cpu;
55  uint32_t found_cpus = 0;
56
57  sparc_leon3_set_cctrl( 0x80000F );
58  found_cpus =
59    ((LEON3_IrqCtrl_Regs->mpstat >> LEON3_IRQMPSTATUS_CPUNR) & 0xf)  + 1;
60
61  #if defined(RTEMS_DEBUG)
62    printk( "Found %d CPUs\n", found_cpus );
63
64    if ( found_cpus > configured_cpu_count ) {
65      printk(
66        "%d CPUs IS MORE THAN CONFIGURED -- ONLY USING %d\n",
67        found_cpus,
68        configured_cpu_count
69      );
70      found_cpus = configured_cpu_count;
71    }
72  #endif
73
74  if ( found_cpus > 1 ) {
75    LEON_Unmask_interrupt(LEON3_MP_IRQ);
76    set_vector(bsp_ap_ipi_isr, LEON_TRAP_TYPE(LEON3_MP_IRQ), 1);
77  }
78
79  for ( cpu = 1 ; cpu < found_cpus ; ++cpu ) {
80    #if defined(RTEMS_DEBUG)
81      printk( "Waking CPU %d\n", cpu );
82    #endif
83
84    LEON3_IrqCtrl_Regs->mpstat = 1 << cpu;
85  }
86
87  return found_cpus;
88}
89
90void _CPU_SMP_Send_interrupt(uint32_t target_processor_index)
91{
92  /* send interrupt to destination CPU */
93  LEON3_IrqCtrl_Regs->force[target_processor_index] = 1 << LEON3_MP_IRQ;
94}
95
96void bsp_smp_broadcast_interrupt(void)
97{
98  uint32_t dest_cpu;
99  uint32_t cpu;
100  uint32_t max_cpus;
101
102  cpu = rtems_smp_get_current_processor();
103  max_cpus = rtems_smp_get_processor_count();
104
105  for ( dest_cpu=0 ; dest_cpu < max_cpus ; dest_cpu++ ) {
106    if ( cpu != dest_cpu ) {
107      _CPU_SMP_Send_interrupt( dest_cpu );
108    }
109  }
110}
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