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Diffstat (limited to 'README.md')
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@@ -12,6 +12,40 @@ https://elinux.org/RPi_Framebuffer https://github.com/bztsrc/raspi3-tutorial https://github.com/rust-embedded/rust-raspberrypi-OS-tutorials +// PRIV LEVL: https://developer.arm.com/documentation/den0013/d/ARM-Processor-Modes-and-Registers +// MODES: https://developer.arm.com/documentation/ddi0406/c/System-Level-Architecture/The-System-Level-Programmers--Model/ARM-processor-modes-and-ARM-core-registers/ARM-processor-modes?lang=en +// EXCEPTION HANDLING: https://developer.arm.com/documentation/ddi0406/c/System-Level-Architecture/The-System-Level-Programmers--Model/Exception-handling?lang=en +// MODE REGISTERS: https://developer.arm.com/documentation/ddi0406/c/System-Level-Architecture/The-System-Level-Programmers--Model/ARM-processor-modes-and-ARM-core-registers/ARM-core-registers?lang=en + ## Todo Implement Scheduler for IRQ Fix mutex with scheduler +Implement handlers +Put threads in user mode + + +Note: SYS and USER share registers but differ in privlige + + +# Modes +From https://developer.arm.com/documentation/den0013/d/ARM-Processor-Modes-and-Registers +User: 10000 PL0 +FIQ : 10001 PL1 +IRQ : 10010 PL1 +SVC : 10011 PL1 +ABT : 10111 PL1 +UND : 11011 PL1 +SYS : 11111 PL1 + +# Registers +From https://developer.arm.com/documentation/ddi0406/c/System-Level-Architecture/The-System-Level-Programmers--Model/ARM-processor-modes-and-ARM-core-registers/ARM-core-registers?lang=en +User: r0-12_usr,sp_usr,lr_usr,CPSR +FIQ: r8-r12_fiq,sp_fiq,lr_fiq,SPSR_fiq +IRQ: sp_irq,lr_irq,SPSR_irq +SVC: sp_svc,lr_svc,SPSR_svc +ABT: sp_abt,lr_abt,SPSR_abt +UND: sp_und,lr_und,SPSR_und +SYS: Same as user + +# Program Status Registers +https://developer.arm.com/documentation/ddi0406/c/System-Level-Architecture/The-System-Level-Programmers--Model/ARM-processor-modes-and-ARM-core-registers/Program-Status-Registers--PSRs-?lang=en#CIHJBHJA |