| 0,0 → 1,142 |
|---|
| /* |
| * Copyright (c) 2006 Ondrej Palkovsky |
| * Copyright (c) 2008 Martin Decky |
| * Copyright (c) 2008 Pavel Rimsky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - 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. |
| * - 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 ``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 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. |
| */ |
| |
| /** @defgroup sgcnfb SGCN |
| * @brief userland driver of the Serengeti console output |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <async.h> |
| #include <sysinfo.h> |
| #include <as.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <ddi.h> |
| |
| #include "serial_console.h" |
| #include "sgcn.h" |
| |
| #define WIDTH 80 |
| #define HEIGHT 24 |
| |
| /** |
| * Virtual address mapped to SRAM. |
| */ |
| static uintptr_t sram_virt_addr; |
| |
| /** |
| * SGCN buffer offset within SGCN. |
| */ |
| static uintptr_t sram_buffer_offset; |
| |
| /** |
| * SGCN buffer header. It is placed at the very beginning of the SGCN |
| * buffer. |
| */ |
| typedef struct { |
| /** hard-wired to "CON" */ |
| char magic[4]; |
| |
| /** we don't need this */ |
| char unused[24]; |
| |
| /** offset within the SGCN buffer of the output buffer start */ |
| uint32_t out_begin; |
| |
| /** offset within the SGCN buffer of the output buffer end */ |
| uint32_t out_end; |
| |
| /** offset within the SGCN buffer of the output buffer read pointer */ |
| uint32_t out_rdptr; |
| |
| /** offset within the SGCN buffer of the output buffer write pointer */ |
| uint32_t out_wrptr; |
| } __attribute__ ((packed)) sgcn_buffer_header_t; |
| |
| |
| /* |
| * Returns a pointer to the object of a given type which is placed at the given |
| * offset from the console buffer beginning. |
| */ |
| #define SGCN_BUFFER(type, offset) \ |
| ((type *) (sram_virt_addr + sram_buffer_offset + (offset))) |
| |
| /** Returns a pointer to the console buffer header. */ |
| #define SGCN_BUFFER_HEADER (SGCN_BUFFER(sgcn_buffer_header_t, 0)) |
| |
| /** |
| * Pushes the character to the SGCN serial. |
| * @param c character to be pushed |
| */ |
| static void sgcn_putc(char c) |
| { |
| uint32_t begin = SGCN_BUFFER_HEADER->out_begin; |
| uint32_t end = SGCN_BUFFER_HEADER->out_end; |
| uint32_t size = end - begin; |
| |
| /* we need pointers to volatile variables */ |
| volatile char *buf_ptr = (volatile char *) |
| SGCN_BUFFER(char, SGCN_BUFFER_HEADER->out_wrptr); |
| volatile uint32_t *out_wrptr_ptr = &(SGCN_BUFFER_HEADER->out_wrptr); |
| volatile uint32_t *out_rdptr_ptr = &(SGCN_BUFFER_HEADER->out_rdptr); |
| |
| uint32_t new_wrptr = (((*out_wrptr_ptr) - begin + 1) % size) + begin; |
| while (*out_rdptr_ptr == new_wrptr) |
| ; |
| *buf_ptr = c; |
| *out_wrptr_ptr = new_wrptr; |
| } |
| |
| /** |
| * Initializes the SGCN serial driver. |
| */ |
| int sgcn_init(void) |
| { |
| sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size")); |
| |
| if (physmem_map((void *) sysinfo_value("sram.address.physical"), |
| (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE, |
| AS_AREA_READ | AS_AREA_WRITE) != 0) |
| return -1; |
| |
| serial_console_init(sgcn_putc, WIDTH, HEIGHT); |
| |
| sram_buffer_offset = sysinfo_value("sram.buffer.offset"); |
| |
| async_set_client_connection(serial_client_connection); |
| return 0; |
| } |
| |
| /** |
| * @} |
| */ |
| |