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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <vm/vm.h>
#include <vm/physseg.h>
#include <sys/panic.h>
#include <assert.h>
/*
* XXX: As of now, these are constant... It would be nice if we could
* have this value expanded upon request so we can keep it small
* to not hog up resources. Would make it more flexible too :^)
*/
#define DYNALLOC_POOL_SZ 0x400000 /* 4 MiB */
#define DYNALLOC_POOL_PAGES (DYNALLOC_POOL_SZ / vm_get_page_size())
static volatile struct vas kernel_vas;
/*
* TODO: Move this to a per CPU structure, this kinda sucks
* how it is right now...
*/
static struct vm_ctx bsp_vm_ctx = {0};
volatile struct limine_hhdm_request g_hhdm_request = {
.id = LIMINE_HHDM_REQUEST,
.revision = 0
};
struct vm_ctx *
vm_get_ctx(void)
{
return &bsp_vm_ctx;
}
/*
* Return the kernel VAS.
*/
struct vas
vm_get_kvas(void)
{
return kernel_vas;
}
void
vm_init(void)
{
void *pool_va;
kernel_vas = pmap_read_vas();
/* Setup virtual memory context */
bsp_vm_ctx.dynalloc_pool_sz = DYNALLOC_POOL_SZ;
bsp_vm_ctx.dynalloc_pool_phys = vm_alloc_pageframe(DYNALLOC_POOL_PAGES);
if (bsp_vm_ctx.dynalloc_pool_phys == 0) {
panic("Failed to allocate dynamic pool\n");
}
pool_va = PHYS_TO_VIRT(bsp_vm_ctx.dynalloc_pool_phys);
bsp_vm_ctx.tlsf_ctx = tlsf_create_with_pool(pool_va, DYNALLOC_POOL_SZ);
__assert(bsp_vm_ctx.tlsf_ctx != 0);
}
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