Fábio Coutada
62e8454f91
- make-uefi-iso.sh: UEFI ISO image builder - test_boot.S, test_boot.ld: test boot assembly and linker script - eim_config.toml: EIM (External Interface Module) configuration - edk2-ovmf RPM for UEFI firmware - GAP_ANALYSIS_PIKEOS_PARITY.md: PikeOS parity gap analysis
155 lines
5.2 KiB
ArmAsm
155 lines
5.2 KiB
ArmAsm
/*
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* UniversalisOS Microkernel — Ambiq Micro Apollo2 Startup (Cortex-M4F)
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*
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* Vector table with 40 external IRQs (IRQ 0–39),
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* Reset_Handler with .data/.bss init.
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*
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* Weak aliases for exception/IRQ handlers — actual implementations
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* for NMI, HardFault, SVC, PendSV, SysTick live in uos_port_context.S.
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*
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* Apollo2 uses Cortex-M4F (ARMv7E-M) — includes extended fault handlers
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* and uses Thumb-2 instructions.
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*/
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.syntax unified
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.cpu cortex-m4
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.thumb
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.fpu fpv4-sp-d16
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/* === Vector table (56 entries: 16 system + 40 IRQ) === */
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.section .vectors, "a"
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.global __Vectors
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__Vectors:
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.word _estack /* 0: Initial stack pointer */
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.word Reset_Handler /* 1: Reset */
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.word NMI_Handler /* 2: NMI */
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.word HardFault_Handler /* 3: Hard fault */
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.word MemManage_Handler /* 4: Memory management */
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.word BusFault_Handler /* 5: Bus fault */
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.word UsageFault_Handler /* 6: Usage fault */
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.word 0 /* 7: Reserved */
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.word 0 /* 8: Reserved */
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.word 0 /* 9: Reserved */
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.word 0 /* 10: Reserved */
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.word SVC_Handler /* 11: SVCall */
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.word DebugMon_Handler /* 12: Debug monitor */
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.word 0 /* 13: Reserved */
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.word PendSV_Handler /* 14: PendSV — context switch */
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.word SysTick_Handler /* 15: SysTick — tick timer */
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/* External IRQs 0–39 (Apollo2 specific) */
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.word Default_Handler /* 0: BOD */
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.word Default_Handler /* 1: Watchdog */
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.word Default_Handler /* 2: RTC */
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.word Default_Handler /* 3: VCOMP */
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.word Default_Handler /* 4: ADC */
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.word Default_Handler /* 5: ACMP0 */
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.word Default_Handler /* 6: ACMP1 */
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.word Default_Handler /* 7: ACMP2 */
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.word Default_Handler /* 8: ACMP3 */
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.word Default_Handler /* 9: GPIO0 */
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.word Default_Handler /* 10: GPIO1 */
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.word Default_Handler /* 11: GPIO2 */
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.word Default_Handler /* 12: GPIO3 */
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.word Default_Handler /* 13: UART0 */
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.word Default_Handler /* 14: UART1 */
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.word Default_Handler /* 15: SPI0 */
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.word Default_Handler /* 16: SPI1 */
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.word Default_Handler /* 17: I2C0 */
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.word Default_Handler /* 18: I2C1 */
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.word Default_Handler /* 19: BLEB0 */
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.word Default_Handler /* 20: BLEB1 */
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.word Default_Handler /* 21: BLEA */
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.word Default_Handler /* 22: GPIO4 */
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.word Default_Handler /* 23: GPIO5 */
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.word Default_Handler /* 24: GPIO6 */
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.word Default_Handler /* 25: GPIO7 */
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.word Default_Handler /* 26: UART2 */
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.word Default_Handler /* 27: UART3 */
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.word Default_Handler /* 28: SPI2 */
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.word Default_Handler /* 29: SPI3 */
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.word Default_Handler /* 30: I2C2 */
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.word Default_Handler /* 31: I2C3 */
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.word Default_Handler /* 32: TIMER0 */
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.word Default_Handler /* 33: TIMER1 */
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.word Default_Handler /* 34: TIMER2 */
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.word Default_Handler /* 35: TIMER3 */
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.word Default_Handler /* 36: TIMER4 */
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.word Default_Handler /* 37: TIMER5 */
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.word Default_Handler /* 38: DMA */
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.word Default_Handler /* 39: USB */
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/* === Reset handler === */
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.section .text.Reset_Handler
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.global Reset_Handler
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.type Reset_Handler, %function
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.thumb_func
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Reset_Handler:
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/* Set stack pointer */
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ldr r0, =_estack
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msr msp, r0
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/* Copy .data from flash to RAM */
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ldr r0, =_sdata
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ldr r1, =_edata
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ldr r2, =_etext
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movs r3, #0
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b .Ldata_check
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.Ldata_loop:
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ldr r4, [r2, r3]
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str r4, [r0, r3]
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adds r3, r3, #4
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.Ldata_check:
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adds r4, r0, r3
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cmp r4, r1
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bne .Ldata_loop
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/* Zero .bss */
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ldr r0, =_sbss
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ldr r1, =_ebss
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movs r2, #0
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b .Lbss_check
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.Lbss_loop:
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str r2, [r0]
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adds r0, r0, #4
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.Lbss_check:
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cmp r0, r1
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bne .Lbss_loop
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/* Call main() */
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bl main
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/* If main returns, loop forever */
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.Lhalt:
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wfi
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b .Lhalt
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.size Reset_Handler, .-Reset_Handler
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/* === Weak exception handler aliases === */
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.weak NMI_Handler
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.thumb_set NMI_Handler, Default_Handler
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.weak HardFault_Handler
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.thumb_set HardFault_Handler, Default_Handler
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.weak MemManage_Handler
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.thumb_set MemManage_Handler, Default_Handler
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.weak BusFault_Handler
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.thumb_set BusFault_Handler, Default_Handler
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.weak UsageFault_Handler
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.thumb_set UsageFault_Handler, Default_Handler
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.weak DebugMon_Handler
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.thumb_set DebugMon_Handler, Default_Handler
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.weak SVC_Handler
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.thumb_set SVC_Handler, Default_Handler
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.weak PendSV_Handler
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.thumb_set PendSV_Handler, Default_Handler
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.weak SysTick_Handler
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.thumb_set SysTick_Handler, Default_Handler
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/* === Default handler (infinite loop) === */
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.section .text.Default_Handler
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.global Default_Handler
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.type Default_Handler, %function
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.thumb_func
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Default_Handler:
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b Default_Handler
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.size Default_Handler, .-Default_Handler
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