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#pragma once
#include <stdint.h>
// The channel takes the lower 4 bits; the data pointer the upper 28. So a mail
// must be aligned to a 16-byte boundary.
#define MAIL_ALIGN 16
enum
{
PROPERTY_CHANNEL = 8,
};
typedef struct Tag {
union {
uint32_t all;
struct {
uint16_t command : 12; // Command.
uint8_t type : 4; // Command type.
uint8_t device : 4; // Hardware device.
uint16_t zeroes : 12; // Reserved.
} id;
};
uint32_t size; // Buffer size.
uint32_t code; // Request/response code.
uint32_t data[1]; // Buffer data.
} Tag;
typedef struct __attribute__((aligned(MAIL_ALIGN))) Mail {
uint32_t size; // Buffer size.
uint32_t code; // Request/response code.
Tag tags[1]; // Variable quantity.
} Mail;
void mbox_init();
const Mail* mbox_read(uint8_t channel);
void mbox_write(uint8_t channel, const void* mail);
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