mirror of
https://github.com/drasko/codezero.git
synced 2026-01-13 11:23:16 +01:00
de087eb1f8
With the addition of used field, capability structure can be used for resource accounting over the capability.
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
|
|
* ARM virtual memory implementation
|
|
*
|
|
* Copyright (C) 2007 Bahadir Balban
|
|
*/
|
|
#include <l4/lib/list.h>
|
|
#include <l4/lib/string.h>
|
|
#include <l4/lib/printk.h>
|
|
#include <l4/generic/space.h>
|
|
#include <l4/generic/tcb.h>
|
|
#include INC_SUBARCH(mm.h)
|
|
#include INC_GLUE(memlayout.h)
|
|
#include INC_GLUE(memory.h)
|
|
#include INC_PLAT(printascii.h)
|
|
#include INC_PLAT(offsets.h)
|
|
#include INC_ARCH(linker.h)
|
|
|
|
/*
|
|
* Conversion from generic protection flags to arch-specific
|
|
* pte flags.
|
|
*/
|
|
unsigned int space_flags_to_ptflags(unsigned int flags)
|
|
{
|
|
switch (flags) {
|
|
case MAP_USR_RW_FLAGS:
|
|
return __MAP_USR_RW_FLAGS;
|
|
case MAP_USR_RO_FLAGS:
|
|
return __MAP_USR_RO_FLAGS;
|
|
case MAP_SVC_RW_FLAGS:
|
|
return __MAP_SVC_RW_FLAGS;
|
|
case MAP_USR_IO_FLAGS:
|
|
return __MAP_USR_IO_FLAGS;
|
|
case MAP_SVC_IO_FLAGS:
|
|
return __MAP_SVC_IO_FLAGS;
|
|
default:
|
|
BUG();
|
|
}
|
|
BUG(); return 0;
|
|
}
|
|
|
|
void task_init_registers(struct ktcb *task, unsigned long pc)
|
|
{
|
|
task->context.pc = (u32)pc;
|
|
task->context.spsr = ARM_MODE_USR;
|
|
}
|
|
|
|
|
|
/*
|
|
* Copies global kernel entries into another pgd. Even for sub-pmd ranges
|
|
* the associated pmd entries are copied, assuming any pmds copied are
|
|
* applicable to all tasks in the system.
|
|
*/
|
|
void copy_pgd_kern_by_vrange(pgd_table_t *to, pgd_table_t *from,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
/* Extend sub-pmd ranges to their respective pmd boundaries */
|
|
start = align(start, PMD_MAP_SIZE);
|
|
|
|
if (end < start)
|
|
end = 0;
|
|
|
|
/* Aligning would overflow if mapping the last virtual pmd */
|
|
if (end < align(~0, PMD_MAP_SIZE) ||
|
|
start > end) /* end may have already overflown as input */
|
|
end = align_up(end, PMD_MAP_SIZE);
|
|
else
|
|
end = 0;
|
|
|
|
copy_pgds_by_vrange(to, from, start, end);
|
|
}
|
|
|
|
/* Copies all standard bits that a user process should have in its pgd */
|
|
void copy_pgd_kern_all(pgd_table_t *to)
|
|
{
|
|
pgd_table_t *from = TASK_PGD(current);
|
|
|
|
copy_pgd_kern_by_vrange(to, from, KERNEL_AREA_START, KERNEL_AREA_END);
|
|
copy_pgd_kern_by_vrange(to, from, IO_AREA_START, IO_AREA_END);
|
|
copy_pgd_kern_by_vrange(to, from, USER_KIP_PAGE,
|
|
USER_KIP_PAGE + PAGE_SIZE);
|
|
copy_pgd_kern_by_vrange(to, from, ARM_HIGH_VECTOR,
|
|
ARM_HIGH_VECTOR + PAGE_SIZE);
|
|
copy_pgd_kern_by_vrange(to, from, ARM_SYSCALL_VECTOR,
|
|
ARM_SYSCALL_VECTOR + PAGE_SIZE);
|
|
|
|
/* We temporarily map uart registers to every process */
|
|
copy_pgd_kern_by_vrange(to, from, USERSPACE_UART_BASE,
|
|
USERSPACE_UART_BASE + PAGE_SIZE);
|
|
}
|
|
|