diff options
Diffstat (limited to 'memory.h')
| -rw-r--r-- | memory.h | 71 |
1 files changed, 54 insertions, 17 deletions
@@ -1,35 +1,72 @@ #ifndef MEMORY_H #define MEMORY_H -#define INTERRUPT_VECTOR_TABLE_START ((uint32_t) 0x0) +#include <stddef.h> + +// 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) -#define STACK_START ((uint32_t) 0x4000) -#define STACK_END ((uint32_t) 0x8000) +// 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 ((uint32_t) &__start) -#define KERNEL_END ((uint32_t) &__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 \ - (((KERNEL_END - (uint32_t) 1) & ~((uint32_t) 0x3fff)) \ - + (uint32_t) 0x4000) +#define TRANSLATION_TABLE_BASE ((size_t) &_translation_table_start) +#define TRANSLATION_TABLE_END ((size_t) &_translation_table_end) -#define TRANSLATION_TABLE_END \ - (TRANSLATION_TABLE_BASE + (uint32_t) (4096 * 4)) +// 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) -#define PRIVILEGED_MEMORY_END TRANSLATION_TABLE_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 UNPRIVILEGED_MEMORY_START \ - (((PRIVILEGED_MEMORY_END - (uint32_t) 1) & ~((uint32_t) 0xfffff)) \ - + (uint32_t) 0x100000) +#define PRIVILEGED_MEMORY_END STACK_END -#define PL0_SECTION_NUMBER ((uint32_t) 0b101010101010) -#define PL0_SECTION_NUMBER_STR "0b101010101010" + +// 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 - + |