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vm: implement a sparse memory model

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This commit is contained in:
max 🍓
2023-02-08 17:13:01 +00:00
parent 6690572bf3
commit a7d4166c89
4 changed files with 285 additions and 9 deletions
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35
include/socks/vm.h
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@@ -14,6 +14,8 @@
#define VM_MAX_ZONES (VM_ZONE_MAX + 1)
/* maximum number of supported page orders */
#define VM_MAX_PAGE_ORDERS (VM_PAGE_MAX_ORDER + 1)
/* maximum number of sparse memory sectors */
#define VM_MAX_SECTORS 1024
#define VM_CHECK_ALIGN(p, mask) ((((p) & (mask)) == (p)) ? 1 : 0)
@@ -189,15 +191,16 @@ typedef struct vm_slab {
typedef struct vm_page {
/* order of the page block that this page belongs too */
uint16_t p_order : 4;
uint32_t p_order : 4;
/* the id of the NUMA node that this page belongs to */
uint16_t p_node : 6;
uint32_t p_node : 6;
/* the id of the memory zone that this page belongs to */
uint16_t p_zone : 3;
/* some unused bits */
uint16_t p_reserved : 3;
uint32_t p_zone : 3;
/* vm_page_flags_t bitfields. */
uint32_t p_sector : 11;
/* some unused bits */
uint32_t p_reserved : 8;
uint32_t p_flags;
/* multi-purpose list.
@@ -216,6 +219,21 @@ typedef struct vm_page {
} __attribute__((aligned(2 * sizeof(unsigned long)))) vm_page_t;
/* represents a sector of memory, containing its own array of vm_pages.
this struct is used under the sparse memory model, instead of the
global vm_page array */
typedef struct vm_sector {
/* sector size. this must be a power of 2.
all sectors in the system have the same size. */
vm_page_order_t s_size;
/* PFN of the first page contained in s_pages.
to find the PFN of any page contained within s_pages,
simply add its offset within the array to s_first_pfn */
size_t s_first_pfn;
/* array of pages contained in this sector */
vm_page_t *s_pages;
} vm_sector_t;
extern kern_status_t vm_bootstrap(const vm_zone_descriptor_t *zones, size_t nr_zones);
extern vm_model_t vm_memory_model(void);
extern void vm_set_memory_model(vm_model_t model);
@@ -264,4 +282,9 @@ extern void vm_flat_init(void);
extern vm_page_t *vm_page_get_flat(phys_addr_t addr);
extern size_t vm_page_get_pfn_flat(vm_page_t *pg);
/* Sparse memory model functions */
extern void vm_sparse_init(void);
extern vm_page_t *vm_page_get_sparse(phys_addr_t addr);
extern size_t vm_page_get_pfn_sparse(vm_page_t *pg);
#endif