sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
924c3d8b5f
nuttx/arch/arm/src/armv7-a/arm_addrenv_shm.c
Masayuki Ishikawa ae378872c2 arch: armv7-a: Remove the code for CONFIG_ARCH_PGPOOL_MAPPING=n 
Summary:
- Currently, CONFIG_ARCH_PGPOOL_MAPPING=y is necessary for
  CONFIG_BUILD_KERNEL=y.
- This commit removes the code for CONFIG_ARCH_PGPOOL_MAPPING=n

Impact:
- None

Testing:
- Tested with sabre-6quad:netknsh_smp

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
2022-09-21 19:57:27 +08:00

273 lines
8.1 KiB
C
Raw Blame History

/****************************************************************************
* arch/arm/src/armv7-a/arm_addrenv_shm.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/sched.h>
#include <nuttx/addrenv.h>
#include "mmu.h"
#include "addrenv.h"
#include "pgalloc.h"
#if defined(CONFIG_BUILD_KERNEL) && defined(CONFIG_MM_SHM)
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_shmat
*
* Description:
* Attach, i.e, map, on shared memory region to a user virtual address
*
* Input Parameters:
* pages - A pointer to the first element in a array of physical address,
* each corresponding to one page of memory.
* npages - The number of pages in the list of physical pages to be mapped.
* vaddr - The virtual address corresponding to the beginning of the
* (contiguous) virtual address region.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int up_shmat(uintptr_t *pages, unsigned int npages, uintptr_t vaddr)
{
struct tcb_s *tcb = nxsched_self();
struct task_group_s *group;
uintptr_t *l1entry;
uint32_t *l2table;
irqstate_t flags;
uintptr_t paddr;
unsigned int nmapped;
unsigned int shmndx;
shminfo("pages=%p npages=%d vaddr=%08lx\n",
pages, npages, (unsigned long)vaddr);
/* Sanity checks */
DEBUGASSERT(pages && npages > 0 && tcb && tcb->group);
DEBUGASSERT(vaddr >= CONFIG_ARCH_SHM_VBASE && vaddr < ARCH_SHM_VEND);
DEBUGASSERT(MM_ISALIGNED(vaddr));
group = tcb->group;
/* Loop until all pages have been mapped into the caller's address space. */
for (nmapped = 0; nmapped < npages; )
{
/* Get the shm[] index associated with the virtual address */
shmndx = (vaddr - CONFIG_ARCH_SHM_VBASE) >> SECTION_SHIFT;
/* Has a level 1 page table entry been created for this virtual
* address.
*/
l1entry = group->tg_addrenv.shm[shmndx];
if (l1entry == NULL)
{
/* No.. Allocate one physical page for the L2 page table */
paddr = mm_pgalloc(1);
if (!paddr)
{
return -ENOMEM;
}
DEBUGASSERT(MM_ISALIGNED(paddr));
/* We need to be more careful after we begin modifying
* global resources.
*/
flags = enter_critical_section();
group->tg_addrenv.shm[shmndx] = (uintptr_t *)paddr;
/* Get the virtual address corresponding to the physical page
* address.
*/
l2table = (uint32_t *)arm_pgvaddr(paddr);
/* Initialize the page table */
memset(l2table, 0, ENTRIES_PER_L2TABLE * sizeof(uint32_t));
}
else
{
/* Get the physical address of the L2 page table from the L1 page
* table entry.
*/
paddr = (uintptr_t)l1entry & ~SECTION_MASK;
flags = enter_critical_section();
/* Get the virtual address corresponding to the physical page\
* address.
*/
l2table = (uint32_t *)arm_pgvaddr(paddr);
}
/* Map the virtual address to this physical address */
DEBUGASSERT(get_l2_entry(l2table, vaddr) == 0);
paddr = *pages++;
set_l2_entry(l2table, paddr, vaddr, MMU_MEMFLAGS);
nmapped++;
vaddr += MM_PGSIZE;
/* Make sure that the initialized L2 table is flushed to physical
* memory.
*
* REVISIT: We could be smarter in doing this. Currently, we may
* flush the entire L2 page table numerous times.
*/
up_flush_dcache((uintptr_t)l2table,
(uintptr_t)l2table +
ENTRIES_PER_L2TABLE * sizeof(uint32_t));
leave_critical_section(flags);
}
return OK;
}
/****************************************************************************
* Name: up_shmdt
*
* Description:
* Detach, i.e, unmap, on shared memory region from a user virtual address
*
* Input Parameters:
* vaddr - The virtual address corresponding to the beginning of the
* (contiguous) virtual address region.
* npages - The number of pages to be unmapped
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
int up_shmdt(uintptr_t vaddr, unsigned int npages)
{
struct tcb_s *tcb = nxsched_self();
struct task_group_s *group;
uintptr_t *l1entry;
uint32_t *l2table;
irqstate_t flags;
uintptr_t paddr;
unsigned int nunmapped;
unsigned int shmndx;
shminfo("npages=%d vaddr=%08lx\n", npages, (unsigned long)vaddr);
/* Sanity checks */
DEBUGASSERT(npages > 0 && tcb && tcb->group);
DEBUGASSERT(vaddr >= CONFIG_ARCH_SHM_VBASE && vaddr < ARCH_SHM_VEND);
DEBUGASSERT(MM_ISALIGNED(vaddr));
group = tcb->group;
/* Loop until all pages have been unmapped from the caller's address
* space.
*/
for (nunmapped = 0; nunmapped < npages; )
{
/* Get the shm[] index associated with the virtual address */
shmndx = (vaddr - CONFIG_ARCH_SHM_VBASE) >> SECTION_SHIFT;
/* Get the level 1 page table entry for this virtual address */
l1entry = group->tg_addrenv.shm[shmndx];
DEBUGASSERT(l1entry != NULL);
/* Get the physical address of the L2 page table from the L1 page
* table entry.
*/
paddr = (uintptr_t)l1entry & ~SECTION_MASK;
flags = enter_critical_section();
/* Get the virtual address corresponding to the physical page
* address.
*/
l2table = (uint32_t *)arm_pgvaddr(paddr);
/* Unmap this virtual page address.
*
* REVISIT: Note that the page allocated for the level 2 page table
* is not freed nor is the level 1 page table entry ever cleared.
* This means that the 4KiB page is still allocated to the process
* even though it may not contain any mappings and that the it will
* persist until the process terminates. That is not all bad because
* it means that we will be able to re-instantiate the shared memory
* mapping very quickly.
*/
DEBUGASSERT(get_l2_entry(l2table, vaddr) != 0);
clr_l2_entry(l2table, vaddr);
nunmapped++;
vaddr += MM_PGSIZE;
/* Make sure that the modified L2 table is flushed to physical
* memory.
*
* REVISIT: We could be smarter in doing this. Currently, we may
* flush the entire L2 page table numerous times.
*/
up_flush_dcache((uintptr_t)l2table,
(uintptr_t)l2table +
ENTRIES_PER_L2TABLE * sizeof(uint32_t));
leave_critical_section(flags);
}
return OK;
}
#endif /* CONFIG_BUILD_KERNEL && CONFIG_MM_SHM */
Reference in New Issue View Git Blame Copy Permalink