From 1af7591e37d09ddcd734ea07d0e999cf61c8bc5e Mon Sep 17 00:00:00 2001 From: vetch Date: Mon, 13 Jan 2020 12:40:38 +0100 Subject: Great Reorganisation, modify structure and makefile --- src/arm/PL1/kernel/memory.h | 72 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 src/arm/PL1/kernel/memory.h (limited to 'src/arm/PL1/kernel/memory.h') diff --git a/src/arm/PL1/kernel/memory.h b/src/arm/PL1/kernel/memory.h new file mode 100644 index 0000000..bdeba52 --- /dev/null +++ b/src/arm/PL1/kernel/memory.h @@ -0,0 +1,72 @@ +#ifndef MEMORY_H +#define MEMORY_H + +#include + +// These macros were heavily used b4 I moved all the address +// computation to the linker script. Now I'm just keeping them +// in case they're needed for something else :) +#define POWER_OF_2(EXP) (((size_t) 1) << EXP) + +#define ALIGN_POWER_OF_2(ADDR, EXP) \ + (((ADDR - 1) & ~(POWER_OF_2(EXP) - 1)) + POWER_OF_2(EXP)) + +#define SECTION_SIZE POWER_OF_2(20) + +#define ALIGN_SECTION(ADDR) ALIGN_POWER_OF_2(ADDR, 20) + + +// memory layout + +#define INTERRUPT_VECTOR_TABLE_START ((uint32_t) 0x0) + +// all those symbols are defined in the linker script +extern char __end; +extern char __start; +extern char _translation_table_start; +extern char _translation_table_end; +extern char _sections_list_start; +extern char _sections_list_end; +extern char _stack_start; +extern char _fiq_stack_start; +extern char _fiq_stack_top; +extern char _irq_stack_start; +extern char _irq_stack_top; +extern char _supervisor_stack_start; +extern char _supervisor_stack_top; +extern char _stack_end; + +#define KERNEL_START ((size_t) &__start) // this is 0x0 +#define KERNEL_END ((size_t) &__end) + +// first 2^14 aligned address after the kernel +#define TRANSLATION_TABLE_BASE ((size_t) &_translation_table_start) +#define TRANSLATION_TABLE_END ((size_t) &_translation_table_end) + +// another 32KB after the translation table are used for sections list +#define SECTIONS_LIST_START ((size_t) &_sections_list_start) +#define SECTIONS_LIST_END ((size_t) &_sections_list_end) + +// first section after the translation table is left unused; +// the next section is used as the stack +#define STACK_START ((size_t) &_stack_start) +#define FIQ_STACK_START ((size_t) &_fiq_stack_start) +#define FIQ_STACK_END ((size_t) &_fiq_stack_top) +#define IRQ_STACK_START ((size_t) &_irq_stack_start) +#define IRQ_STACK_END ((size_t) &_irq_stack_top) +#define SUPERVISOR_STACK_START ((size_t) &_supervisor_stack_start) +#define SUPERVISOR_STACK_END ((size_t) &_supervisor_stack_top) +#define STACK_END ((size_t) &_stack_end) + +#define PRIVILEGED_MEMORY_END STACK_END + + +// the following describes the virtual section for our PL0 programs +#define PL0_SECTION_NUMBER ((size_t) 0xaaa) + +#define VIRTUAL_PL0_MEMORY_START (PL0_SECTION_NUMBER << 20) +#define VIRTUAL_PL0_MEMORY_END \ + (VIRTUAL_PL0_MEMORY_START + SECTION_SIZE) + +#endif // MEMORY_H + -- cgit v1.2.3