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69 lines
1.8 KiB
69 lines
1.8 KiB
2 years ago
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/*
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* scanning the emulated memory from the DTS (Device Tree String).
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* output: the availability and the size (stored in "uint64 g_mem_size") of emulated memory.
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*
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* codes are borrowed from riscv-pk (https://github.com/riscv/riscv-pk)
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*/
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#include "dts_parse.h"
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#include "spike_interface/spike_utils.h"
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#include "string.h"
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uint64 g_mem_size;
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struct mem_scan {
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int memory;
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const uint32 *reg_value;
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int reg_len;
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};
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static void mem_open(const struct fdt_scan_node *node, void *extra) {
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struct mem_scan *scan = (struct mem_scan *)extra;
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memset(scan, 0, sizeof(*scan));
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}
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static void mem_prop(const struct fdt_scan_prop *prop, void *extra) {
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struct mem_scan *scan = (struct mem_scan *)extra;
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if (!strcmp(prop->name, "device_type") && !strcmp((const char *)prop->value, "memory")) {
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scan->memory = 1;
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} else if (!strcmp(prop->name, "reg")) {
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scan->reg_value = prop->value;
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scan->reg_len = prop->len;
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}
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}
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static void mem_done(const struct fdt_scan_node *node, void *extra) {
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struct mem_scan *scan = (struct mem_scan *)extra;
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const uint32 *value = scan->reg_value;
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const uint32 *end = value + scan->reg_len / 4;
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uint64 self = (uint64)mem_done;
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if (!scan->memory) return;
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assert(scan->reg_value && scan->reg_len % 4 == 0);
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while (end - value > 0) {
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uint64 base, size;
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value = fdt_get_address(node->parent, value, &base);
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value = fdt_get_size(node->parent, value, &size);
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if (base <= self && self <= base + size) {
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g_mem_size = size;
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}
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}
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assert(end == value);
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}
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// scanning the emulated memory
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void query_mem(uint64 fdt) {
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struct fdt_cb cb;
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struct mem_scan scan;
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memset(&cb, 0, sizeof(cb));
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cb.open = mem_open;
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cb.prop = mem_prop;
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cb.done = mem_done;
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cb.extra = &scan;
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g_mem_size = 0;
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fdt_scan(fdt, &cb);
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assert(g_mem_size > 0);
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}
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