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diff --git a/sys/riscv/riscv/pmap.c b/sys/riscv/riscv/pmap.c
--- a/sys/riscv/riscv/pmap.c
+++ b/sys/riscv/riscv/pmap.c
@@ -540,37 +540,109 @@
return (pt);
}
-static void
-pmap_bootstrap_dmap(vm_offset_t kern_l1, vm_paddr_t min_pa, vm_paddr_t max_pa)
+/*
+ * Construct the direct map -- a linear mapping of physical memory into
+ * the kernel address space.
+ *
+ * We walk the list of physical memory segments (of arbitrary size and
+ * address) mapping each appropriately using L2 and L1 superpages.
+ * Consequently, the DMAP address space will have unmapped regions
+ * corresponding to any holes between physical memory segments.
+ *
+ * The lowest usable physical address will always be mapped to
+ * DMAP_MIN_ADDRESS.
+ */
+static vm_paddr_t
+pmap_bootstrap_dmap(pd_entry_t *l1, vm_paddr_t freemempos)
{
+ vm_paddr_t physmap[PHYS_AVAIL_ENTRIES];
vm_offset_t va;
- vm_paddr_t pa;
- pd_entry_t *l1;
- u_int l1_slot;
- pt_entry_t entry;
- pn_t pn;
+ vm_paddr_t min_pa, max_pa, pa, endpa;
+ pd_entry_t *l2;
+ u_int l1slot, l2slot;
+ int physmap_idx;
+
+ physmap_idx = physmem_avail(physmap, nitems(physmap));
+ min_pa = physmap[0];
+ max_pa = physmap[physmap_idx - 1];
- pa = dmap_phys_base = min_pa & ~L1_OFFSET;
- va = DMAP_MIN_ADDRESS;
- l1 = (pd_entry_t *)kern_l1;
- l1_slot = pmap_l1_index(DMAP_MIN_ADDRESS);
+ printf("physmap_idx %u\n", physmap_idx);
+ printf("min_pa %lx\n", min_pa);
+ printf("max_pa %lx\n", max_pa);
- for (; va < DMAP_MAX_ADDRESS && pa < max_pa;
- pa += L1_SIZE, va += L1_SIZE, l1_slot++) {
- KASSERT(l1_slot < Ln_ENTRIES, ("Invalid L1 index"));
+ /* Set the limits of the DMAP region. */
+ dmap_phys_base = rounddown(min_pa, L1_SIZE);
+ dmap_phys_max = max_pa;
- /* superpages */
- pn = (pa / PAGE_SIZE);
- entry = PTE_KERN;
- entry |= (pn << PTE_PPN0_S);
- pmap_store(&l1[l1_slot], entry);
+ /* Walk the physmap table. */
+ l2 = NULL;
+ l1slot = Ln_ENTRIES; /* sentinel value */
+ for (int idx = 0; idx < physmap_idx; idx += 2) {
+ pa = rounddown(physmap[idx], L2_SIZE);
+ endpa = physmap[idx + 1];
+
+ /* Virtual address for this range. */
+ va = PHYS_TO_DMAP(pa);
+
+ /* Any 1GB possible for this range? */
+ if (roundup(pa, L1_SIZE) + L1_SIZE > endpa)
+ goto l2end;
+
+ /* Loop until the next 1GB boundary. */
+ while ((pa & L1_OFFSET) != 0) {
+ if (l2 == NULL || pmap_l1_index(va) != l1slot) {
+ /* Need to alloc another page table. */
+ l2 = pmap_early_alloc_tables(&freemempos, 1);
+
+ /* Link it. */
+ l1slot = pmap_l1_index(va);
+ pmap_store(&l1[l1slot],
+ L1_PDE((vm_paddr_t)l2, PTE_V));
+ }
+
+ /* map l2 pages */
+ l2slot = pmap_l2_index(va);
+ pmap_store(&l2[l2slot], L2_PTE(pa, PTE_KERN));
+
+ pa += L2_SIZE;
+ va += L2_SIZE;
+ }
+
+ /* Map what we can with 1GB superpages. */
+ while (pa + L1_SIZE - 1 < endpa) {
+ /* map l1 pages */
+ l1slot = pmap_l1_index(va);
+ pmap_store(&l1[l1slot], L1_PTE(pa, PTE_KERN));
+
+ pa += L1_SIZE;
+ va += L1_SIZE;
+ }
+
+l2end:
+ while (pa < endpa) {
+ if (l2 == NULL || pmap_l1_index(va) != l1slot) {
+ /* Need to alloc another page table. */
+ l2 = pmap_early_alloc_tables(&freemempos, 1);
+
+ /* Link it. */
+ l1slot = pmap_l1_index(va);
+ pmap_store(&l1[l1slot],
+ L1_PDE((vm_paddr_t)l2, PTE_V));
+ }
+
+ /* map l2 pages */
+ l2slot = pmap_l2_index(va);
+ pmap_store(&l2[l2slot], L2_PTE(pa, PTE_KERN));
+
+ pa += L2_SIZE;
+ va += L2_SIZE;
+ }
}
- /* Set the upper limit of the DMAP region */
- dmap_phys_max = pa;
+ /* And finally, the limit on DMAP VA. */
dmap_max_addr = va;
- sfence_vma();
+ return (freemempos);
}
/*
@@ -589,7 +661,7 @@
*/
static vm_paddr_t
pmap_create_pagetables(vm_paddr_t kernstart, vm_size_t kernlen,
- vm_paddr_t min_pa, vm_paddr_t max_pa, vm_paddr_t *root_pt_phys)
+ vm_paddr_t *root_pt_phys)
{
pt_entry_t *l0, *l1, *kern_l2, *kern_l3, *devmap_l3;
pd_entry_t *devmap_l2;
@@ -657,6 +729,9 @@
nkernl3 = 16;
kern_l3 = pmap_early_alloc_tables(&freemempos, nkernl3);
+ /* Bootstrap the direct map. */
+ freemempos = pmap_bootstrap_dmap(l1, freemempos);
+
/* Allocations are done. */
if (freemempos < roundup2(kernend, L2_SIZE))
freemempos = roundup2(kernend, L2_SIZE);
@@ -714,9 +789,6 @@
pa = (vm_paddr_t)devmap_l2;
pmap_store(&l1[slot], L1_PDE(pa, PTE_V));
- /* Bootstrap the direct map. */
- pmap_bootstrap_dmap((vm_offset_t)l1, min_pa, max_pa);
-
/* Return the next position of free memory */
return (freemempos);
}
@@ -727,14 +799,11 @@
void
pmap_bootstrap(vm_offset_t l1pt, vm_paddr_t kernstart, vm_size_t kernlen)
{
- vm_paddr_t physmap[PHYS_AVAIL_ENTRIES];
- vm_paddr_t freemempos;
- vm_paddr_t max_pa, min_pa, pa;
+ vm_paddr_t freemempos, pa;
vm_paddr_t root_pt_phys;
vm_offset_t freeva;
vm_offset_t dpcpu, msgbufpv;
pt_entry_t *pte;
- u_int physmap_idx;
int i;
printf("pmap_bootstrap %lx %lx %lx\n", l1pt, kernstart, kernlen);
@@ -752,31 +821,8 @@
*/
CPU_SET(PCPU_GET(hart), &kernel_pmap->pm_active);
- /* Assume the address we were loaded to is a valid physical address. */
- min_pa = max_pa = kernstart;
-
- physmap_idx = physmem_avail(physmap, nitems(physmap));
- physmap_idx /= 2;
-
- /*
- * Find the minimum physical address. physmap is sorted,
- * but may contain empty ranges.
- */
- for (i = 0; i < physmap_idx * 2; i += 2) {
- if (physmap[i] == physmap[i + 1])
- continue;
- if (physmap[i] <= min_pa)
- min_pa = physmap[i];
- if (physmap[i + 1] > max_pa)
- max_pa = physmap[i + 1];
- }
- printf("physmap_idx %u\n", physmap_idx);
- printf("min_pa %lx\n", min_pa);
- printf("max_pa %lx\n", max_pa);
-
/* Create a new set of pagetables to run the kernel in. */
- freemempos = pmap_create_pagetables(kernstart, kernlen, min_pa, max_pa,
- &root_pt_phys);
+ freemempos = pmap_create_pagetables(kernstart, kernlen, &root_pt_phys);
/* Switch to the newly created page tables. */
kernel_pmap->pm_stage = PM_STAGE1;

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