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PoC: Remove IRQ30 from fw/irqpoc_with_app

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Removing IRQ30 since it us no longer exist
This commit is contained in:
Mikael Ågren 2024-12-17 13:40:31 +01:00
parent a7c9250166
commit c9ae734aab
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GPG Key ID: E02DA3D397792C46
1 changed files with 9 additions and 22 deletions
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31
hw/application_fpga/fw/irqpoc_with_app/start.S
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@ -3,10 +3,11 @@
* SPDX-License-Identifier: GPL-2.0-only
*/
// This firmware copies an app from ROM to app RAM. The app triggers both
// IRQ_SYSCALL_HI and IRQ_SYSCALL_LO. One after the other. Finally, the
// app tries to jump firmware. This should result in a trap since the
// app in executing in app mode.
// This firmware copies an app from ROM to app RAM. The app triggers IRQ_SYSCALL
// Checks are done to make sure that firmware RAM can/cannot be read depending
// on wether we're executing from firmware, syscall or app.
// Finally the app tries to jump firmware. This should result in a trap since
// the app is executing in app mode.
//
#include "custom_ops.S" // PicoRV32 custom instructions
@ -25,17 +26,9 @@ _start:
irq_handler:
// PicoRV32 stores the IRQ bitmask in x4.
// If bit 31 is 1: IRQ31 was triggered.
// If bit 30 is 1: IRQ30 was triggered.
irq_syscall_lo_check:
li t4, (1 << 30)
bne x4, t4, irq_syscall_hi_check
// Firmware RAM should not be readable from IRQ_SYSCALL_LO
call check_cannot_read_test_val_from_fw_ram
j irq_source_check_done
irq_syscall_hi_check:
li t4, (1 << 31)
bne x4, t4, unexpected_irq
// Firmware RAM should be readable from IRQ_SYSCALL_HI
// Firmware RAM should be readable from IRQ_SYSCALL
call check_can_read_test_val_from_fw_ram
j irq_source_check_done
unexpected_irq:
@ -56,9 +49,8 @@ init:
// Firmware RAM should be readable from firmware mode
call check_can_read_test_val_from_fw_ram
// Enable IRQs
li t0, 0x3fffffff // IRQ31 & IRQ30 mask
li t0, 0x7fffffff // IRQ31
picorv32_maskirq_insn(zero, t0) // Enable IRQs
// Copy app to App RAM
@ -84,13 +76,8 @@ app_start:
// Firmware RAM should not be readable from app mode
call check_cannot_read_test_val_from_fw_ram
// Raise IRQ_SYSCALL_HI
li t0, 0xe1000000 // IRQ_SYSCALL_HI (IRQ31) trigger address
sw zero, 0(t0) // Raise IRQ by writing to interrupt trigger address.
// Writing any data triggers an interrupt.
// Raise IRQ_SYSCALL_LO
li t0, 0xe0000000 // IRQ_SYSCALL_LO (IRQ30) trigger address
// Raise IRQ_SYSCALL
li t0, 0xe1000000 // IRQ_SYSCALL (IRQ31) trigger address
sw zero, 0(t0) // Raise IRQ by writing to interrupt trigger address.
// Writing any data triggers an interrupt.