a20e59da15
Depthcharge uses the keyboard type to help determine whether it can trust the keyboard for security-sensitive confirmations. Currently it trusts anything except usb, but now there's a need to distrust ec-based ps/2 keyboards that are associated with untrusted ECs. To help facilitate this, coreboot needs to report more details about non-usb keyboards, so this change replaces the current instances of unknown with enum values that distinguish uart and gpio from ec-based keyboards. BUG=b:129471321 BRANCH=None TEST=Local compile and flash to systems with trusted and non-trusted ECs. Confirmed that security confirmation can't be performed via keyboard on a system with an untrusted EC but can still be performed on a system with a trusted EC. Change-Id: Iee6295dafadf7cb3da98b62f43b0e184b2b69b1e Signed-off-by: Matt Delco <delco@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/32717 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*
|
|
* Copyright 2013 Google Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <libpayload.h>
|
|
#include <stdint.h>
|
|
|
|
struct s5p_uart
|
|
{
|
|
uint32_t ulcon; // line control
|
|
uint32_t ucon; // control
|
|
uint32_t ufcon; // FIFO control
|
|
uint32_t umcon; // modem control
|
|
uint32_t utrstat; // Tx/Rx status
|
|
uint32_t uerstat; // Rx error status
|
|
uint32_t ufstat; // FIFO status
|
|
uint32_t umstat; // modem status
|
|
uint32_t utxh; // transmit buffer
|
|
uint32_t urxh; // receive buffer
|
|
uint32_t ubrdiv; // baud rate divisor
|
|
uint32_t ufracval; // divisor fractional value
|
|
uint32_t uintp; // interrupt pending
|
|
uint32_t uints; // interrupt source
|
|
uint32_t uintm; // interrupt mask
|
|
};
|
|
|
|
static struct s5p_uart *uart_regs;
|
|
|
|
void serial_putchar(unsigned int c)
|
|
{
|
|
const uint32_t TxFifoFullBit = (0x1 << 24);
|
|
|
|
while (readl(&uart_regs->ufstat) & TxFifoFullBit)
|
|
{;}
|
|
|
|
writeb(c, &uart_regs->utxh);
|
|
if (c == '\n')
|
|
serial_putchar('\r');
|
|
}
|
|
|
|
int serial_havechar(void)
|
|
{
|
|
const uint32_t DataReadyMask = (0xf << 0) | (0x1 << 8);
|
|
|
|
return (readl(&uart_regs->ufstat) & DataReadyMask) != 0;
|
|
}
|
|
|
|
int serial_getchar(void)
|
|
{
|
|
while (!serial_havechar())
|
|
{;}
|
|
|
|
return readb(&uart_regs->urxh);
|
|
}
|
|
|
|
static struct console_output_driver s5p_serial_output =
|
|
{
|
|
.putchar = &serial_putchar
|
|
};
|
|
|
|
static struct console_input_driver s5p_serial_input =
|
|
{
|
|
.havekey = &serial_havechar,
|
|
.getchar = &serial_getchar,
|
|
.input_type = CONSOLE_INPUT_TYPE_UART,
|
|
};
|
|
|
|
void serial_init(void)
|
|
{
|
|
if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr)
|
|
return;
|
|
|
|
uart_regs = (struct s5p_uart *)lib_sysinfo.serial->baseaddr;
|
|
}
|
|
|
|
void serial_console_init(void)
|
|
{
|
|
serial_init();
|
|
|
|
if (uart_regs) {
|
|
console_add_output_driver(&s5p_serial_output);
|
|
console_add_input_driver(&s5p_serial_input);
|
|
}
|
|
}
|