69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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#include <assert.h>
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#include <coherent_page.h>
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#include <log.h>
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#include <mbox.h>
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#include <mem.h>
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#include <stdbool.h>
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#include <string.h>
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#include <tag.h>
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struct __attribute__((packed)) property_buf {
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uint32_t size;
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uint32_t code;
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uint8_t tags[0];
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};
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struct __attribute__((packed)) property_tag {
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uint32_t id;
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uint32_t value_len;
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uint32_t param_len;
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};
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bool gilbraltar_get_tags(void *tags, size_t len) {
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struct property_buf *buf =
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(struct property_buf *)get_coherent_page(PROP_MAILBOX);
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uintptr_t dma = (uintptr_t)buf;
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uint32_t *top = (uint32_t *)(buf->tags + len);
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assert((((uintptr_t)buf) & (16 - 1)) == 0);
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assert(len >= sizeof(struct property_tag) + sizeof(uint32_t));
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uint32_t size = sizeof(struct property_buf) + len + sizeof(uint32_t);
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assert((size & 3) == 0);
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buf->size = size;
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buf->code = CODE_REQUEST;
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memcpy(buf->tags, tags, len);
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*top = PROPTAG_END;
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data_sync_barrier();
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if (gilbraltar_mbox_write_read(dma) != dma)
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return false;
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data_mem_barrier();
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if (buf->code != CODE_RESPONSE_SUCCESS)
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return false;
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memcpy(tags, buf->tags, len);
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return true;
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}
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#define VALUE_LENGTH_RESPONSE (1 << 31)
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bool gilbraltar_get_tag(uint32_t tag, void *buf, size_t len, size_t param_len) {
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struct property_tag *hdr = buf;
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hdr->id = tag;
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hdr->value_len = len - sizeof(struct property_tag);
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hdr->param_len = param_len & ~VALUE_LENGTH_RESPONSE;
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if (!gilbraltar_get_tags(buf, len))
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return false;
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hdr->param_len &= ~VALUE_LENGTH_RESPONSE;
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if (hdr->param_len == 0)
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return false;
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return true;
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}
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