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/*
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* Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __CONSOLE_H__
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#define __CONSOLE_H__
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#include <utils_def.h>
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#define CONSOLE_T_NEXT (U(0) * REGSZ)
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#define CONSOLE_T_FLAGS (U(1) * REGSZ)
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#define CONSOLE_T_PUTC (U(2) * REGSZ)
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#define CONSOLE_T_GETC (U(3) * REGSZ)
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#define CONSOLE_T_FLUSH (U(4) * REGSZ)
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#define CONSOLE_T_DRVDATA (U(5) * REGSZ)
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#define CONSOLE_FLAG_BOOT BIT(0)
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#define CONSOLE_FLAG_RUNTIME BIT(1)
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#define CONSOLE_FLAG_CRASH BIT(2)
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/* Bits 3 to 7 reserved for additional scopes in future expansion. */
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#define CONSOLE_FLAG_SCOPE_MASK ((U(1) << 8) - 1)
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/* Bits 8 to 31 reserved for non-scope use in future expansion. */
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/* Returned by getc callbacks when receive FIFO is empty. */
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#define ERROR_NO_PENDING_CHAR (-1)
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/* Returned by console_xxx() if no registered console implements xxx. */
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#define ERROR_NO_VALID_CONSOLE (-128)
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#ifndef __ASSEMBLY__
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#include <types.h>
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typedef struct console {
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struct console *next;
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u_register_t flags;
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int (*putc)(int character, struct console *console);
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int (*getc)(struct console *console);
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int (*flush)(struct console *console);
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/* Additional private driver data may follow here. */
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} console_t;
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#include <console_assertions.h> /* offset macro assertions for console_t */
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/*
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* NOTE: There is no publicly accessible console_register() function. Consoles
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* are registered by directly calling the register function of a specific
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* implementation, e.g. console_16550_register() from <uart_16550.h>. Consoles
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* registered that way can be unregistered/reconfigured with below functions.
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*/
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/* Remove a single console_t instance from the console list. */
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int console_unregister(console_t *console);
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multi console: Assert that consoles aren't registered twice
In the multi console driver, allowing to register the same console more
than once may result in an infinte loop when putc is called.
If, for example, a boot message is trying to be printed, but the
consoles in the loop in the linked list are runtime consoles, putc will
iterate forever looking for a console that can print boot messages (or
a NULL pointer that will never come).
This loop in the linked list can occur after restoring the system from a
system suspend. The boot console is registered during the cold boot in
BL31, but the runtime console is registered even in the warm boot path.
Consoles are always added to the start of the linked list when they are
registered, so this it what should happen if they were actually
different structures:
console_list -> NULL
console_list -> BOOT -> NULL
console_list -> RUNTIME -> BOOT -> NULL
console_list -> RUNTIME -> RUNTIME -> BOOT -> NULL
In practice, the two runtime consoles are the same one, so they create
this loop:
console_list -> RUNTIME -. X -> BOOT -> NULL
^ |
`----'
This patch adds an assertion to detect this problem. The assertion will
fail whenever the same structure tries to be registered while being on
the list.
In order to assert this, console_is_registered() has been implemented.
It returns 1 if the specified console is registered, 0 if not.
Change-Id: I922485e743775ca9bd1af9cbd491ddd360526a6d
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
7 years ago
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/* Returns 1 if this console is already registered, 0 if not */
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int console_is_registered(console_t *console);
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/*
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* Set scope mask of a console that determines in what states it is active.
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* By default they are registered with (CONSOLE_FLAG_BOOT|CONSOLE_FLAG_CRASH).
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*/
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void console_set_scope(console_t *console, unsigned int scope);
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/* Switch to a new global console state (CONSOLE_FLAG_BOOT/RUNTIME/CRASH). */
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void console_switch_state(unsigned int new_state);
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/* Output a character on all consoles registered for the current state. */
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int console_putc(int c);
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/* Read a character (blocking) from any console registered for current state. */
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int console_getc(void);
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/* Flush all consoles registered for the current state. */
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int console_flush(void);
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#if !MULTI_CONSOLE_API
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/* REMOVED on AArch64 -- use console_<driver>_register() instead! */
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int console_init(uintptr_t base_addr,
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unsigned int uart_clk, unsigned int baud_rate);
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void console_uninit(void);
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __CONSOLE_H__ */
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