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-rw-r--r--README.md87
-rw-r--r--src/boot.S1
2 files changed, 45 insertions, 43 deletions
diff --git a/README.md b/README.md
index d6b76a6..4417996 100644
--- a/README.md
+++ b/README.md
@@ -1,60 +1,61 @@
# Jobbed
## Supplemental Links
-- https://www.raspberrypi.com/documentation/computers/processors.html
-- https://datasheets.raspberrypi.com/bcm2835/bcm2835-peripherals.pdf
-- https://datasheets.raspberrypi.com/bcm2836/bcm2836-peripherals.pdf
-- https://github.com/eggman/raspberrypi/tree/master/qemu-raspi2
-- https://github.com/eggman/FreeRTOS-raspi3/blob/master/Demo/FreeRTOS_tick_config.c
-- https://developer.arm.com/documentation/dui0802/b/A64-General-Instructions/A64-general-instructions-in-alphabetical-order?lang=en
-- https://wiki.osdev.org/ARM_RaspberryPi
-- 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
+ - https://www.raspberrypi.com/documentation/computers/processors.html
+ - https://datasheets.raspberrypi.com/bcm2835/bcm2835-peripherals.pdf
+ - https://datasheets.raspberrypi.com/bcm2836/bcm2836-peripherals.pdf
+ - https://github.com/eggman/raspberrypi/tree/master/qemu-raspi2
+ - https://github.com/eggman/FreeRTOS-raspi3/blob/master/Demo/FreeRTOS_tick_config.c
+ - https://developer.arm.com/documentation/dui0802/b/A64-General-Instructions/A64-general-instructions-in-alphabetical-order?lang=en
+ - https://wiki.osdev.org/ARM_RaspberryPi
+ - 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 Lock for accessing thread information
-- Fix mutex with scheduler
-- Implement handlers
+ - Implement Lock for accessing thread information
+ - Fix mutex with scheduler
+ - Implement handlers
## SVC Calls
-- Sysinfo
-- Reboot?
-- Mutex Create
-- Mutex Lock
-- Mutex Release
-- Schedule
-- Yield
-- Uart Write Buffer Add (Add reoccuring task to flush write buffer - RotatingBuffer)
+ - Sysinfo
+ - Reboot?
+ - Mutex Create
+ - Mutex Lock
+ - Mutex Release
+ - Schedule
+ - Yield
+ - Fork
+ - Uart Write Buffer Add (Add reoccuring task to flush write buffer - RotatingBuffer)
Note: SYS and USER share registers but differ in privilege
# 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
+ - 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
+ - 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
+ - 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
diff --git a/src/boot.S b/src/boot.S
index 8900980..0cbd8e3 100644
--- a/src/boot.S
+++ b/src/boot.S
@@ -106,6 +106,7 @@ undefined:
// subs pc, lr, #4
ldmfd sp!, {r0-r12,pc}^
svc:
+ cpsid f
stmfd sp!, {r0-r12,lr}
ldr r0, [lr, #-4]
bic r0, #0xFF000000