a C standard library for fx Casio calculators
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#ifndef __LIB_SYS_MMAN_H__
# define __LIB_SYS_MMAN_H__
#include <stddef.h>
#include <stdint.h>
#ifndef __KERNEL_MEMORY_H__
// mapping flags
// Protection (unused)
#define PROT_READ 0x1 /* Page can be read. */
#define PROT_WRITE 0x2 /* Page can be written. */
#define PROT_EXEC 0x4 /* Page can be executed. */
#define PROT_NONE 0x0 /* Page can not be accessed. */
// Mapping flags
#define MAP_SHARED 0x01 /* Share changes. */
#define MAP_PRIVATE 0x02 /* Changes are private. */
#define MAP_ANONYMOUS 0x20 /* Don't use a file. */
#define MAP_ANON MAP_ANONYMOUS /* Don't use a file. */
#define MAP_FILE 0 /* Ignored. */
#define MAP_GROWSDOWN 0x00100 /* Stack-like segment. */
#define MAP_DENYWRITE 0x00800 /* ETXTBSY. */
#define MAP_EXECUTABLE 0x01000 /* Mark it as an executable. */
#define MAP_LOCKED 0x02000 /* Lock the mapping. */
#define MAP_NORESERVE 0x04000 /* Don't check for reservations. */
#define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables. */
#define MAP_NONBLOCK 0x10000 /* Do not block on IO. */
#define MAP_STACK 0x20000 /* Allocation is for a stack. */
#define MAP_HUGETLB 0x40000 /* Create huge page mapping. */
#define MAP_SYNC 0x80000 /* Perform synchronous page
faults for the mapping. */
#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED but do not unmap
underlying mapping. */
#define MAP_UNINITIALIZED 0x200000 /* Don't clear anonymous page */
// Value returned when mmap value
#define MAP_FAILED ((void*) -1)
** Map addresses starting near ADDR and extending for LEN bytes. from
** OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
** is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
** set in FLAGS, the mapping will be at ADDR exactly (which must be
** page-aligned); otherwise the system chooses a convenient nearby address.
** The return value is the actual mapping address chosen or MAP_FAILED
** for errors (in which case `errno' is set). A successful `mmap' call
** deallocates any previous mapping for the affected region.
extern void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset);
** Deallocate any mapping for the region starting at ADDR and extending LEN bytes.
** Returns 0 if successful, -1 for errors (and sets errno).
extern int munmap(void *addr, size_t length);
#endif /*__LIB_SYS_MMAN_H__*/