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#ifndef MEMORY_H
#define MEMORY_H
#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)
// 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
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