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57 lines
1.4 KiB
57 lines
1.4 KiB
/* |
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* Copyright (c) 2021 EPAM Systems |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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* |
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* This driver implements input/output API for Xen domain through the |
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* Xen consoleio interface. This should be used only for Zephyr as initial |
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* domain (Dom0). For unprivileged domains regular ring buffer HVC driver |
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* should be used (uart_hvc_xen.c), this console will not be available. |
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*/ |
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#include <zephyr/arch/arm64/hypercall.h> |
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#include <zephyr/xen/public/xen.h> |
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#include <zephyr/device.h> |
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#include <zephyr/drivers/uart.h> |
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#include <zephyr/init.h> |
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#include <zephyr/kernel.h> |
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#define DT_DRV_COMPAT xen_hvc_consoleio |
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static int xen_consoleio_poll_in(const struct device *dev, |
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unsigned char *c) |
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{ |
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int ret = 0; |
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char temp; |
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ret = HYPERVISOR_console_io(CONSOLEIO_read, sizeof(temp), &temp); |
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if (!ret) { |
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/* Char was not received */ |
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return -1; |
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} |
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*c = temp; |
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return 0; |
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} |
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static void xen_consoleio_poll_out(const struct device *dev, |
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unsigned char c) |
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{ |
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(void) HYPERVISOR_console_io(CONSOLEIO_write, sizeof(c), &c); |
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} |
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static DEVICE_API(uart, xen_consoleio_hvc_api) = { |
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.poll_in = xen_consoleio_poll_in, |
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.poll_out = xen_consoleio_poll_out, |
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}; |
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static int xen_consoleio_init(const struct device *dev) |
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{ |
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/* Nothing to do, but still needed for device API */ |
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return 0; |
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} |
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DEVICE_DT_INST_DEFINE(0, xen_consoleio_init, NULL, NULL, |
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NULL, PRE_KERNEL_1, CONFIG_XEN_HVC_INIT_PRIORITY, |
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&xen_consoleio_hvc_api);
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