From 5c15e93fa87800b1f8fae7ef688a9d41221526f1 Mon Sep 17 00:00:00 2001 From: Nathan Lee Date: Fri, 19 Jun 2026 19:05:01 -0500 Subject: create dtb allocator the parent commit (b106df2447d23d6b3fcffa7cc87edde218d054f3) discussed the possibility of creating dtb device discovery. for that, we have replaced wdt device discovery with dtb device discovery. in the future, we will use the pci kernel module to use device discovery via a PCI controller --- kernel/bump.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 kernel/bump.c (limited to 'kernel/bump.c') diff --git a/kernel/bump.c b/kernel/bump.c new file mode 100644 index 0000000..369f92f --- /dev/null +++ b/kernel/bump.c @@ -0,0 +1,49 @@ +#include +#include + +static char eheap[EHEAP_SIZE] = {0}; +static size_t eheap_off = 0; + +struct mem_info *km_find_memory(struct dt_node *head) { + struct dt_node *child = head->children; + while (child) { + return km_find_memory(child); + child = child->next; + } + + if (strlen(head->name) != 0) { + struct dt_prop *prop_head = head->props; + while (prop_head) { + if (strcmp(prop_head->name, "device_type") == 0 + && strcmp(prop_head->value, "memory") == 0) { + size_t len = 0; + uint32_t *reg = (uint32_t *)dt_get_prop(head, "reg", &len); + if (reg && len >= 8) { + uint32_t base = be32_to_cpu(reg[0]); + uint32_t size = be32_to_cpu(reg[1]); + struct mem_info *ret = kemalloc(sizeof(struct mem_info)); + ret->start = (void*)base; + ret->size = (size_t)size; + + return ret; + } + } + prop_head = prop_head->next; + } + } + return NULL; +} + + +void* kemalloc(size_t size) { + size = (size + 7) & ~7; + + if (eheap_off + size > EHEAP_SIZE) { + return NULL; + } + + void *ptr = &eheap[eheap_off]; + eheap_off += size; + return ptr; +} + -- cgit v1.2.3