Start designing vmem framework

6 files changed, 89 insertions, 29 deletions

diff --git a/arch/riscv/common/vmem.c b/arch/riscv/common/vmem.c
index ef89ec3..207df34 100644
--- a/arch/riscv/common/vmem.c
+++ b/arch/riscv/common/vmem.c
@@ -1,7 +1,7 @@
 #include <apos/string.h>
 #include <apos/pmem.h>
+#include <apos/vmem.h>
 #include <pages.h>
-#include <vmem.h>
 
 #define pte_ppn(pte) (((pm_t)(pte)) >> 10)
 #define pte_flags(pte) (((pm_t)(pte)) & 0xff)
@@ -13,7 +13,7 @@ void map_vmem(struct vm_branch_t *branch,
 		pm_t paddr, vm_t vaddr,
 		uint8_t flags, enum mm_order_t order)
 {
-	enum mm_order_t top = MAX_ORDER;
+	enum mm_order_t top = __mm_max_order;
 	while(top != order){
 		size_t idx = pm_to_index(vaddr, top);
 
@@ -45,3 +45,29 @@ void unmap_vmem(struct vm_branch_t *branch,
 
 	branch->leaf[idx] = 0;
 }
+
+vm_t map_vregion(struct vm_branch_t *branch, pm_t base, pm_t top, vm_t start, vm_t end)
+{
+	/* TODO: figure out how to find first suitable memory region */
+
+	/* find first free page, iterate forward until we either fit the whole
+	 * physical region or hit a used page
+	 *
+	 * continue until we hit end?
+	 */
+}
+
+void unmap_vregion(struct vm_branch_t *branch, pm_t base, pm_t top)
+{
+	/* TODO */
+}
+
+vm_t map_vsize(struct vm_branch_t *branch, size_t size)
+{
+	/* TODO */
+}
+
+void unmap_vsize(struct vm_branch_t *branch, size_t size)
+{
+	/* TODO */
+}
diff --git a/arch/riscv/config.h b/arch/riscv/config.h
index f223ee7..75c898f 100644
--- a/arch/riscv/config.h
+++ b/arch/riscv/config.h
@@ -1,12 +1,12 @@
 #include <apos/sizes.h>
+
+/* --- START ARCH USER CONFIG VALUES --- */
+/* physical address to which the kernel will be loaded */
 #define PM_KERN		0x83800000
+/* --- END ARCH USER CONFIG VALUES --- */
+
+/* don't touch >:( */
+
 #define PM_STACK_BASE	(PM_KERN + SZ_2M)
 #define PM_STACK_TOP	(PM_STACK_BASE + SZ_2M - 2)
 #define VM_KERN		(-SZ_1G)
-
-#define MAX_ORDER 3
-#define PAGE_SHIFT 12
-#define O0_WIDTH 9
-#define O1_WIDTH 9
-#define O2_WIDTH 9
-#define O3_WIDTH 9
diff --git a/arch/riscv/include/csr.h b/arch/riscv/include/csr.h
index 5da0882..ab25bdd 100644
--- a/arch/riscv/include/csr.h
+++ b/arch/riscv/include/csr.h
@@ -1,8 +1,11 @@
 #ifndef APOS_CSR_H
 #define APOS_CSR_H
 
-#define SATP_MODE_39 0x8000000000000000
-#define SATP_MODE_48 0x9000000000000000
+#include <apos/utils.h>
+
+#define SATP_MODE_Sv32 0x80000000
+#define SATP_MODE_Sv39 0x8000000000000000
+#define SATP_MODE_Sv48 0x9000000000000000
 
 #define CSR_SATP 0x180
 
diff --git a/arch/riscv/include/vmem.h b/arch/riscv/include/vmem.h
index 0aad780..ec2a3ba 100644
--- a/arch/riscv/include/vmem.h
+++ b/arch/riscv/include/vmem.h
@@ -1,7 +1,6 @@
 #ifndef APOS_RISCV_VMAP_H
 #define APOS_RISCV_VMAP_H
 
-#include <apos/sizes.h>
 #include <apos/types.h>
 #include <apos/attrs.h>
 
@@ -19,11 +18,4 @@ struct __packed vm_branch_t {
 	struct vm_branch_t *leaf[512];
 };
 
-void map_vmem(struct vm_branch_t *branch,
-		pm_t paddr, vm_t vaddr,
-		uint8_t flags, enum mm_order_t order);
-
-void unmap_vmem(struct vm_branch_t *branch, vm_t vaddr, enum mm_order_t order);
-
-
 #endif /* APOS_RISCV_VMAP_H */
diff --git a/arch/riscv/init/init.c b/arch/riscv/init/init.c
index a64bdf5..48fa661 100644
--- a/arch/riscv/init/init.c
+++ b/arch/riscv/init/init.c
@@ -6,10 +6,10 @@
 #include <apos/string.h>
 #include <apos/debug.h>
 #include <apos/pmem.h>
+#include <apos/vmem.h>
 #include <apos/utils.h>
 #include <libfdt.h>
 #include <pages.h>
-#include <vmem.h>
 #include <csr.h>
 
 struct pm_layout_t {
@@ -125,8 +125,38 @@ static void mark_reserved_mem(void *fdt)
 	mark_area_used(base, top);
 }
 
+static void init_pmem(void *fdt)
+{
+	enum mm_mode_t mmode = get_mmode(fdt);
+
+	size_t max_order = 0;
+	size_t order_width = 9;
+	switch(mmode){
+		case Sv32:
+			max_order = 1;
+			order_width = 10;
+			break;
+
+		case Sv39:
+			max_order = 2;
+			break;
+
+		case Sv48:
+			max_order = 3;
+			break;
+	};
+
+	size_t widths[10] = {0};
+	for(size_t i = 0; i <= max_order; ++i)
+		widths[i] = order_width;
+
+	init_mem(max_order, widths, 12);
+}
+
 static void setup_pmem(void *fdt)
 {
+	init_pmem(fdt);
+
 	struct pm_layout_t pmem = get_memlayout(fdt);
 
 	pm_t initrd_top = get_initrdtop(fdt);
@@ -203,13 +233,21 @@ struct vm_branch_t *prepare_vmem()
 	return branch;
 }
 
-void start_vmem(struct vm_branch_t *branch)
+void start_vmem(void *fdt, struct vm_branch_t *branch)
 {
-	/* assume Sv48 and ASID 0*/
-	/* TODO: get ASID from CPU id
-	 * TODO: more cores lol
-	 */
-	csr_write(CSR_SATP, SATP_MODE_48 | (((pm_t)(branch)) >> 12));
+	/* TODO: get ASID from CPU id */
+
+	/* TODO: probably unnecessary optimisations but this could be cached? */
+	enum mm_mode_t m = get_mmode(fdt);
+
+	if(m == Sv32)
+		csr_write(CSR_SATP, SATP_MODE_Sv32 | pm_to_pnum((pm_t)(branch)));
+	else if (m == Sv39)
+		csr_write(CSR_SATP, SATP_MODE_Sv39 | pm_to_pnum((pm_t)(branch)));
+	else
+		csr_write(CSR_SATP, SATP_MODE_Sv48 | pm_to_pnum((pm_t)(branch)));
+
+	/* Sv57 && Sv64 in the future? */
 }
 
 struct init_data_t populate_initdata(void *fdt, struct vm_branch_t *branch)
@@ -240,10 +278,9 @@ void init(void *fdt)
 	dbg_fdt(fdt);
 	setup_pmem(fdt);
 
-
 	struct vm_branch_t *branch = prepare_vmem();
 	struct init_data_t d = populate_initdata(fdt, branch);
-	start_vmem(branch);
+	start_vmem(fdt, branch);
 
 	/* update_pmap(TODO: figure out where to place pmap in vmem); */
 	void (*main)(struct init_data_t) = (void (*)(struct init_data_t))VM_KERN;
diff --git a/arch/riscv/kernel/main.c b/arch/riscv/kernel/main.c
index 5566d63..c8eca26 100644
--- a/arch/riscv/kernel/main.c
+++ b/arch/riscv/kernel/main.c
@@ -1,5 +1,6 @@
 #include <apos/debug.h>
 #include <apos/init.h>
+#include <apos/vmem.h>
 
 void __main main(struct init_data_t d)
 {
@@ -14,6 +15,7 @@ void __main main(struct init_data_t d)
 
 	/* functionality that should be implemented:
 	 * figure out best continuous run of memory (pmap etc)
-	 * arbitrary mapping and kernel mapping (memory)
+	 * arbitrary user and kernel mapping (memory)
+	 * vm to pm
 	 */
 }