179 lines
3.8 KiB
C
179 lines
3.8 KiB
C
#include "tb_cxxrtl_io.h"
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#include "hazard3_csr.h"
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#include "hazard3_irq.h"
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// Set IRQ mask (meie0) wide-open, then pend the IRQs one by one and log their
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// firing.
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#define mie_meie 0x800u
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int main() {
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asm volatile ("csrsi mstatus, 0x8");
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h3irq_array_write(hazard3_csr_meiea, 0, 0xffffu);
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h3irq_array_write(hazard3_csr_meiea, 1, 0xffffu);
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write_csr(mie, mie_meie);
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for (int i = 0; i < 32; ++i) {
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tb_printf("Setting IRQ %d\n", i);
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tb_set_irq_masked(1u << i);
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}
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return 0;
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}
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void __attribute__((interrupt)) isr_external_irq() {
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tb_puts("-> external irq handler\n");
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tb_assert(read_csr(mcause) == 0x8000000bu, "mcause should indicate external IRQ\n");
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// External IRQ does not appear pending because, after taking the
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// interrupt, it no longer has sufficient priority to preempt.
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tb_assert(read_csr(mip) == 0x080u, "mip should indicate timer IRQ only\n");
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// meinext updates dynamically, should be read exactly once at the start of an
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// IRQ handler.
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uint32_t meinext = read_csr(hazard3_csr_meinext);
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tb_printf("meinext = %u\n", meinext);
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tb_printf(
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"meipa = %08x\n",
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h3irq_array_read(hazard3_csr_meipa, 0) |
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((uint32_t)h3irq_array_read(hazard3_csr_meipa, 1) << 16)
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);
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// meinext is scaled by 4 to make it cheaper to index a software vector table.
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tb_assert(h3irq_pending(meinext >> 2), "IRQ indicated by meinext is not pending\n");
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tb_clr_irq_masked(1u << (meinext >> 2));
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}
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/*EXPECTED-OUTPUT***************************************************************
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Setting IRQ 0
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-> external irq handler
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meinext = 0
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meipa = 00000001
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Setting IRQ 1
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-> external irq handler
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meinext = 4
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meipa = 00000002
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Setting IRQ 2
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-> external irq handler
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meinext = 8
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meipa = 00000004
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Setting IRQ 3
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-> external irq handler
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meinext = 12
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meipa = 00000008
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Setting IRQ 4
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-> external irq handler
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meinext = 16
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meipa = 00000010
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Setting IRQ 5
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-> external irq handler
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meinext = 20
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meipa = 00000020
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Setting IRQ 6
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-> external irq handler
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meinext = 24
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meipa = 00000040
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Setting IRQ 7
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-> external irq handler
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meinext = 28
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meipa = 00000080
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Setting IRQ 8
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-> external irq handler
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meinext = 32
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meipa = 00000100
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Setting IRQ 9
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-> external irq handler
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meinext = 36
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meipa = 00000200
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Setting IRQ 10
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-> external irq handler
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meinext = 40
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meipa = 00000400
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Setting IRQ 11
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-> external irq handler
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meinext = 44
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meipa = 00000800
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Setting IRQ 12
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-> external irq handler
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meinext = 48
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meipa = 00001000
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Setting IRQ 13
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-> external irq handler
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meinext = 52
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meipa = 00002000
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Setting IRQ 14
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-> external irq handler
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meinext = 56
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meipa = 00004000
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Setting IRQ 15
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-> external irq handler
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meinext = 60
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meipa = 00008000
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Setting IRQ 16
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-> external irq handler
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meinext = 64
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meipa = 00010000
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Setting IRQ 17
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-> external irq handler
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meinext = 68
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meipa = 00020000
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Setting IRQ 18
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-> external irq handler
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meinext = 72
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meipa = 00040000
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Setting IRQ 19
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-> external irq handler
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meinext = 76
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meipa = 00080000
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Setting IRQ 20
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-> external irq handler
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meinext = 80
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meipa = 00100000
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Setting IRQ 21
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-> external irq handler
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meinext = 84
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meipa = 00200000
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Setting IRQ 22
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-> external irq handler
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meinext = 88
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meipa = 00400000
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Setting IRQ 23
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-> external irq handler
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meinext = 92
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meipa = 00800000
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Setting IRQ 24
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-> external irq handler
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meinext = 96
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meipa = 01000000
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Setting IRQ 25
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-> external irq handler
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meinext = 100
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meipa = 02000000
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Setting IRQ 26
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-> external irq handler
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meinext = 104
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meipa = 04000000
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Setting IRQ 27
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-> external irq handler
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meinext = 108
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meipa = 08000000
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Setting IRQ 28
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-> external irq handler
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meinext = 112
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meipa = 10000000
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Setting IRQ 29
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-> external irq handler
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meinext = 116
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meipa = 20000000
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Setting IRQ 30
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-> external irq handler
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meinext = 120
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meipa = 40000000
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Setting IRQ 31
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-> external irq handler
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meinext = 124
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meipa = 80000000
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*******************************************************************************/
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