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sandbox: vm: add synchronisation using spinlocks

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This commit is contained in:
max 🍓
2023-02-02 21:14:02 +00:00
parent d4449b8d87
commit 4237b6ca20
3 changed files with 28 additions and 2 deletions
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19
sandbox/vm/zone.c
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@@ -1,4 +1,5 @@
#include "socks/queue.h"
#include <socks/locks.h>
#include <socks/queue.h>
#include <socks/types.h>
#include <socks/vm.h>
#include <string.h>
@@ -96,6 +97,10 @@ void vm_zone_init(vm_zone_t *z, const vm_zone_descriptor_t *zone_info)
zone_info->zd_name, zone_info->zd_base, zone_info->zd_limit);
memset(z, 0x0, sizeof *z);
memcpy(&z->z_info, zone_info, sizeof *zone_info);
z->z_lock = SPIN_LOCK_INIT;
unsigned long flags;
spin_lock_irqsave(&z->z_lock, &flags);
phys_addr_t block_start = zone_info->zd_base, block_end = zone_info->zd_limit;
int this_page_reserved = 0, last_page_reserved = -1;
@@ -126,6 +131,8 @@ void vm_zone_init(vm_zone_t *z, const vm_zone_descriptor_t *zone_info)
if (block_start != block_end) {
convert_region_to_blocks(z, block_start, block_end + VM_PAGE_SIZE - 1, this_page_reserved);
}
spin_unlock_irqrestore(&z->z_lock, flags);
}
static int replenish_free_page_list(vm_zone_t *z, vm_page_order_t order)
@@ -179,8 +186,12 @@ static int replenish_free_page_list(vm_zone_t *z, vm_page_order_t order)
vm_page_t *vm_zone_alloc_page(vm_zone_t *z, vm_page_order_t order, vm_flags_t flags)
{
unsigned long irq_flags;
spin_lock_irqsave(&z->z_lock, &irq_flags);
int result = replenish_free_page_list(z, order);
if (result != 0) {
spin_unlock_irqrestore(&z->z_lock, irq_flags);
return NULL;
}
@@ -190,11 +201,15 @@ vm_page_t *vm_zone_alloc_page(vm_zone_t *z, vm_page_order_t order, vm_flags_t fl
i->p_flags |= VM_PAGE_ALLOC;
}
spin_unlock_irqrestore(&z->z_lock, irq_flags);
return pg;
}
void vm_zone_free_page(vm_zone_t *z, vm_page_t *pg)
{
unsigned long irq_flags;
spin_lock_irqsave(&z->z_lock, &irq_flags);
pg->p_flags &= ~VM_PAGE_ALLOC;
queue_push_back(&z->z_free_pages[pg->p_order], &pg->p_list);
@@ -211,4 +226,6 @@ void vm_zone_free_page(vm_zone_t *z, vm_page_t *pg)
pg = huge;
}
spin_unlock_irqrestore(&z->z_lock, irq_flags);
}