7760 uts: tem should be able to display UTF-8

[unleashed.git] / usr / src / uts / common / io / tem.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * ANSI terminal emulator module; parse ANSI X3.64 escape sequences and
 * the like.
 *
 * How Virtual Terminal Emulator Works:
 *
 * Every virtual terminal is associated with a tem_vt_state structure
 * and maintains a virtual screen buffer in tvs_screen_buf, which contains
 * all the characters which should be shown on the physical screen when
 * the terminal is activated.  There are also two other buffers, tvs_fg_buf
 * and tvs_bg_buf, which track the foreground and background colors of the
 * on screen characters
 *
 * Data written to a virtual terminal is composed of characters which
 * should be displayed on the screen when this virtual terminal is
 * activated, fg/bg colors of these characters, and other control
 * information (escape sequence, etc).
 *
 * When data is passed to a virtual terminal it first is parsed for
 * control information by tem_safe_parse().  Subsequently the character
 * and color data are written to tvs_screen_buf, tvs_fg_buf, and
 * tvs_bg_buf.  They are saved in these buffers in order to refresh
 * the screen when this terminal is activated.  If the terminal is
 * currently active, the data (characters and colors) are also written
 * to the physical screen by invoking a callback function,
 * tem_safe_text_callbacks() or tem_safe_pix_callbacks().
 *
 * When rendering data to the framebuffer, if the framebuffer is in
 * VIS_PIXEL mode, the character data will first be converted to pixel
 * data using tem_safe_pix_bit2pix(), and then the pixels get displayed
 * on the physical screen.  We only store the character and color data in
 * tem_vt_state since the bit2pix conversion only happens when actually
 * rendering to the physical framebuffer.
 */


#include <sys/types.h>
#include <sys/file.h>
#include <sys/conf.h>
#include <sys/errno.h>
#include <sys/open.h>
#include <sys/cred.h>
#include <sys/kmem.h>
#include <sys/ascii.h>
#include <sys/consdev.h>
#include <sys/font.h>
#include <sys/fbio.h>
#include <sys/conf.h>
#include <sys/modctl.h>
#include <sys/strsubr.h>
#include <sys/stat.h>
#include <sys/visual_io.h>
#include <sys/mutex.h>
#include <sys/param.h>
#include <sys/debug.h>
#include <sys/cmn_err.h>
#include <sys/console.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/sunldi.h>
#include <sys/tem_impl.h>
#ifdef _HAVE_TEM_FIRMWARE
#include <sys/promif.h>
#endif /* _HAVE_TEM_FIRMWARE */
#include <sys/consplat.h>
#include <sys/kd.h>
#include <sys/sysmacros.h>
#include <sys/note.h>
#include <sys/t_lock.h>

/* Terminal emulator internal helper functions */
static void     tems_setup_terminal(struct vis_devinit *, size_t, size_t);
static void     tems_modechange_callback(struct vis_modechg_arg *,
                struct vis_devinit *);

static void     tems_reset_colormap(cred_t *, enum called_from);

static void     tem_free_buf(struct tem_vt_state *);
static void     tem_internal_init(struct tem_vt_state *, cred_t *, boolean_t,
                    boolean_t);
static void     tems_get_initial_color(tem_color_t *pcolor);

/*
 * Globals
 */
static ldi_ident_t      term_li = NULL;
tem_state_t     tems;   /* common term info */
_NOTE(MUTEX_PROTECTS_DATA(tems.ts_lock, tems))

extern struct mod_ops mod_miscops;

static struct modlmisc  modlmisc = {
        &mod_miscops,   /* modops */
        "ANSI Terminal Emulator", /* name */
};

static struct modlinkage modlinkage = {
        MODREV_1, (void *)&modlmisc, NULL
};

int
_init(void)
{
        int ret;
        ret = mod_install(&modlinkage);
        if (ret != 0)
                return (ret);
        ret = ldi_ident_from_mod(&modlinkage, &term_li);
        if (ret != 0) {
                (void) mod_remove(&modlinkage);
                return (ret);
        }

        mutex_init(&tems.ts_lock, (char *)NULL, MUTEX_DRIVER, NULL);
        list_create(&tems.ts_list, sizeof (struct tem_vt_state),
            offsetof(struct tem_vt_state, tvs_list_node));
        tems.ts_active = NULL;

        return (0);
}

int
_fini()
{
        int ret;

        ret = mod_remove(&modlinkage);
        if (ret == 0) {
                ldi_ident_release(term_li);
                term_li = NULL;
        }
        return (ret);
}

int
_info(struct modinfo *modinfop)
{
        return (mod_info(&modlinkage, modinfop));
}

static void
tem_add(struct tem_vt_state *tem)
{
        ASSERT(MUTEX_HELD(&tems.ts_lock) && MUTEX_HELD(&tem->tvs_lock));

        list_insert_head(&tems.ts_list, tem);
}

static void
tem_rm(struct tem_vt_state *tem)
{
        ASSERT(MUTEX_HELD(&tems.ts_lock) && MUTEX_HELD(&tem->tvs_lock));

        list_remove(&tems.ts_list, tem);
}

/*
 * This is the main entry point to the module.  It handles output requests
 * during normal system operation, when (e.g.) mutexes are available.
 */
void
tem_write(tem_vt_state_t tem_arg, uchar_t *buf, ssize_t len, cred_t *credp)
{
        struct tem_vt_state *tem = (struct tem_vt_state *)tem_arg;

        mutex_enter(&tems.ts_lock);
        mutex_enter(&tem->tvs_lock);

        if (!tem->tvs_initialized) {
                mutex_exit(&tem->tvs_lock);
                mutex_exit(&tems.ts_lock);
                return;
        }

        tem_safe_check_first_time(tem, credp, CALLED_FROM_NORMAL);
        tem_safe_terminal_emulate(tem, buf, len, credp, CALLED_FROM_NORMAL);

        mutex_exit(&tem->tvs_lock);
        mutex_exit(&tems.ts_lock);
}

static void
tem_internal_init(struct tem_vt_state *ptem, cred_t *credp,
    boolean_t init_color, boolean_t clear_screen)
{
        int i, j;
        int width, height;
        int total;
        text_color_t fg;
        text_color_t bg;
        size_t  tc_size = sizeof (text_color_t);

        ASSERT(MUTEX_HELD(&tems.ts_lock) && MUTEX_HELD(&ptem->tvs_lock));

        if (tems.ts_display_mode == VIS_PIXEL) {
                ptem->tvs_pix_data_size = tems.ts_pix_data_size;
                ptem->tvs_pix_data =
                    kmem_alloc(ptem->tvs_pix_data_size, KM_SLEEP);
        }

        ptem->tvs_outbuf_size = tems.ts_c_dimension.width;
        ptem->tvs_outbuf =
            (unsigned char *)kmem_alloc(ptem->tvs_outbuf_size, KM_SLEEP);

        width = tems.ts_c_dimension.width;
        height = tems.ts_c_dimension.height;
        ptem->tvs_screen_buf_size = width * height;
        ptem->tvs_screen_buf =
            (unsigned char *)kmem_alloc(width * height, KM_SLEEP);

        total = width * height * tc_size;
        ptem->tvs_fg_buf = (text_color_t *)kmem_alloc(total, KM_SLEEP);
        ptem->tvs_bg_buf = (text_color_t *)kmem_alloc(total, KM_SLEEP);
        ptem->tvs_color_buf_size = total;

        tem_safe_reset_display(ptem, credp, CALLED_FROM_NORMAL,
            clear_screen, init_color);

        ptem->tvs_utf8_left = 0;
        ptem->tvs_utf8_partial = 0;

        tem_safe_get_color(ptem, &fg, &bg, TEM_ATTR_SCREEN_REVERSE);
        for (i = 0; i < height; i++)
                for (j = 0; j < width; j++) {
                        ptem->tvs_screen_buf[i * width + j] = ' ';
                        ptem->tvs_fg_buf[(i * width +j) * tc_size] = fg;
                        ptem->tvs_bg_buf[(i * width +j) * tc_size] = bg;

                }

        ptem->tvs_initialized  = 1;
}

int
tem_initialized(tem_vt_state_t tem_arg)
{
        struct tem_vt_state *ptem = (struct tem_vt_state *)tem_arg;
        int ret;

        mutex_enter(&ptem->tvs_lock);
        ret = ptem->tvs_initialized;
        mutex_exit(&ptem->tvs_lock);

        return (ret);
}

tem_vt_state_t
tem_init(cred_t *credp)
{
        struct tem_vt_state *ptem;

        ptem = kmem_zalloc(sizeof (struct tem_vt_state), KM_SLEEP);
        mutex_init(&ptem->tvs_lock, (char *)NULL, MUTEX_DRIVER, NULL);

        mutex_enter(&tems.ts_lock);
        mutex_enter(&ptem->tvs_lock);

        ptem->tvs_isactive = B_FALSE;
        ptem->tvs_fbmode = KD_TEXT;

        /*
         * A tem is regarded as initialized only after tem_internal_init(),
         * will be set at the end of tem_internal_init().
         */
        ptem->tvs_initialized = 0;


        if (!tems.ts_initialized) {
                /*
                 * Only happens during early console configuration.
                 */
                tem_add(ptem);
                mutex_exit(&ptem->tvs_lock);
                mutex_exit(&tems.ts_lock);
                return ((tem_vt_state_t)ptem);
        }

        tem_internal_init(ptem, credp, B_TRUE, B_FALSE);
        tem_add(ptem);
        mutex_exit(&ptem->tvs_lock);
        mutex_exit(&tems.ts_lock);

        return ((tem_vt_state_t)ptem);
}

/*
 * re-init the tem after video mode has changed and tems_info has
 * been re-inited. The lock is already held.
 */
static void
tem_reinit(struct tem_vt_state *tem, boolean_t reset_display)
{
        ASSERT(MUTEX_HELD(&tems.ts_lock) && MUTEX_HELD(&tem->tvs_lock));

        tem_free_buf(tem); /* only free virtual buffers */

        /* reserve color */
        tem_internal_init(tem, kcred, B_FALSE, reset_display);
}

static void
tem_free_buf(struct tem_vt_state *tem)
{
        ASSERT(tem != NULL && MUTEX_HELD(&tem->tvs_lock));

        if (tem->tvs_outbuf != NULL)
                kmem_free(tem->tvs_outbuf, tem->tvs_outbuf_size);
        if (tem->tvs_pix_data != NULL)
                kmem_free(tem->tvs_pix_data, tem->tvs_pix_data_size);
        if (tem->tvs_screen_buf != NULL)
                kmem_free(tem->tvs_screen_buf, tem->tvs_screen_buf_size);
        if (tem->tvs_fg_buf != NULL)
                kmem_free(tem->tvs_fg_buf, tem->tvs_color_buf_size);
        if (tem->tvs_bg_buf != NULL)
                kmem_free(tem->tvs_bg_buf, tem->tvs_color_buf_size);
}

void
tem_destroy(tem_vt_state_t tem_arg, cred_t *credp)
{
        struct tem_vt_state *tem = (struct tem_vt_state *)tem_arg;

        mutex_enter(&tems.ts_lock);
        mutex_enter(&tem->tvs_lock);

        if (tem->tvs_isactive && tem->tvs_fbmode == KD_TEXT)
                tem_safe_blank_screen(tem, credp, CALLED_FROM_NORMAL);

        tem_free_buf(tem);
        tem_rm(tem);

        if (tems.ts_active == tem)
                tems.ts_active = NULL;

        mutex_exit(&tem->tvs_lock);
        mutex_exit(&tems.ts_lock);

        kmem_free(tem, sizeof (struct tem_vt_state));
}

static int
tems_failed(cred_t *credp, boolean_t finish_ioctl)
{
        int     lyr_rval;

        ASSERT(MUTEX_HELD(&tems.ts_lock));

        if (finish_ioctl)
                (void) ldi_ioctl(tems.ts_hdl, VIS_DEVFINI, 0,
                    FWRITE|FKIOCTL, credp, &lyr_rval);

        (void) ldi_close(tems.ts_hdl, NULL, credp);
        tems.ts_hdl = NULL;
        return (ENXIO);
}

/*
 * only called once during boot
 */
int
tem_info_init(char *pathname, cred_t *credp)
{
        int                     lyr_rval, ret;
        struct vis_devinit      temargs;
        char                    *pathbuf;
        size_t height = 0;
        size_t width = 0;
        struct tem_vt_state *p;

        mutex_enter(&tems.ts_lock);

        if (tems.ts_initialized) {
                mutex_exit(&tems.ts_lock);
                return (0);
        }

        /*
         * Open the layered device using the devfs physical device name
         * after adding the /devices prefix.
         */
        pathbuf = kmem_alloc(MAXPATHLEN, KM_SLEEP);
        (void) strcpy(pathbuf, "/devices");
        if (i_ddi_prompath_to_devfspath(pathname,
            pathbuf + strlen("/devices")) != DDI_SUCCESS) {
                cmn_err(CE_WARN, "terminal-emulator:  path conversion error");
                kmem_free(pathbuf, MAXPATHLEN);

                mutex_exit(&tems.ts_lock);
                return (ENXIO);
        }
        if (ldi_open_by_name(pathbuf, FWRITE, credp,
            &tems.ts_hdl, term_li) != 0) {
                cmn_err(CE_WARN, "terminal-emulator:  device path open error");
                kmem_free(pathbuf, MAXPATHLEN);

                mutex_exit(&tems.ts_lock);
                return (ENXIO);
        }
        kmem_free(pathbuf, MAXPATHLEN);

        temargs.modechg_cb  = (vis_modechg_cb_t)tems_modechange_callback;
        temargs.modechg_arg = NULL;

        /*
         * Initialize the console and get the device parameters
         */
        if (ldi_ioctl(tems.ts_hdl, VIS_DEVINIT,
            (intptr_t)&temargs, FWRITE|FKIOCTL, credp, &lyr_rval) != 0) {
                cmn_err(CE_WARN, "terminal emulator: Compatible fb not found");
                ret = tems_failed(credp, B_FALSE);
                mutex_exit(&tems.ts_lock);
                return (ret);
        }

        /* Make sure the fb driver and terminal emulator versions match */
        if (temargs.version != VIS_CONS_REV) {
                cmn_err(CE_WARN,
                    "terminal emulator: VIS_CONS_REV %d (see sys/visual_io.h) "
                    "of console fb driver not supported", temargs.version);
                ret = tems_failed(credp, B_TRUE);
                mutex_exit(&tems.ts_lock);
                return (ret);
        }

        if ((tems.ts_fb_polledio = temargs.polledio) == NULL) {
                cmn_err(CE_WARN, "terminal emulator: fb doesn't support polled "
                    "I/O");
                ret = tems_failed(credp, B_TRUE);
                mutex_exit(&tems.ts_lock);
                return (ret);
        }

        /* other sanity checks */
        if (!((temargs.depth == 4) || (temargs.depth == 8) ||
            (temargs.depth == 24) || (temargs.depth == 32))) {
                cmn_err(CE_WARN, "terminal emulator: unsupported depth");
                ret = tems_failed(credp, B_TRUE);
                mutex_exit(&tems.ts_lock);
                return (ret);
        }

        if ((temargs.mode != VIS_TEXT) && (temargs.mode != VIS_PIXEL)) {
                cmn_err(CE_WARN, "terminal emulator: unsupported mode");
                ret = tems_failed(credp, B_TRUE);
                mutex_exit(&tems.ts_lock);
                return (ret);
        }

        if ((temargs.mode == VIS_PIXEL) && plat_stdout_is_framebuffer())
                plat_tem_get_prom_size(&height, &width);

        /*
         * Initialize the common terminal emulator info
         */
        tems_setup_terminal(&temargs, height, width);

        tems_reset_colormap(credp, CALLED_FROM_NORMAL);
        tems_get_initial_color(&tems.ts_init_color);

        tems.ts_initialized = 1; /* initialization flag */

        for (p = list_head(&tems.ts_list); p != NULL;
            p = list_next(&tems.ts_list, p)) {
                mutex_enter(&p->tvs_lock);
                tem_internal_init(p, credp, B_TRUE, B_FALSE);
                if (temargs.mode == VIS_PIXEL)
                        tem_pix_align(p, credp, CALLED_FROM_NORMAL);
                mutex_exit(&p->tvs_lock);
        }

        mutex_exit(&tems.ts_lock);
        return (0);
}

#define TEMS_DEPTH_DIFF         0x01
#define TEMS_DIMENSION_DIFF     0x02

static uchar_t
tems_check_videomode(struct vis_devinit *tp)
{
        uchar_t result = 0;

        if (tems.ts_pdepth != tp->depth)
                result |= TEMS_DEPTH_DIFF;

        if (tp->mode == VIS_TEXT) {
                if (tems.ts_c_dimension.width != tp->width ||
                    tems.ts_c_dimension.height != tp->height)
                        result |= TEMS_DIMENSION_DIFF;
        } else {
                if (tems.ts_p_dimension.width != tp->width ||
                    tems.ts_p_dimension.height != tp->height)
                        result |= TEMS_DIMENSION_DIFF;
        }

        return (result);
}

static void
tems_setup_terminal(struct vis_devinit *tp, size_t height, size_t width)
{
        int i;
        int old_blank_buf_size = tems.ts_c_dimension.width;

        ASSERT(MUTEX_HELD(&tems.ts_lock));

        tems.ts_pdepth = tp->depth;
        tems.ts_linebytes = tp->linebytes;
        tems.ts_display_mode = tp->mode;

        switch (tp->mode) {
        case VIS_TEXT:
                tems.ts_p_dimension.width = 0;
                tems.ts_p_dimension.height = 0;
                tems.ts_c_dimension.width = tp->width;
                tems.ts_c_dimension.height = tp->height;
                tems.ts_callbacks = &tem_safe_text_callbacks;

                break;

        case VIS_PIXEL:
                /*
                 * First check to see if the user has specified a screen size.
                 * If so, use those values.  Else use 34x80 as the default.
                 */
                if (width == 0) {
                        width = TEM_DEFAULT_COLS;
                        height = TEM_DEFAULT_ROWS;
                }
                tems.ts_c_dimension.height = (screen_size_t)height;
                tems.ts_c_dimension.width = (screen_size_t)width;

                tems.ts_p_dimension.height = tp->height;
                tems.ts_p_dimension.width = tp->width;

                tems.ts_callbacks = &tem_safe_pix_callbacks;

                /*
                 * set_font() will select a appropriate sized font for
                 * the number of rows and columns selected.  If we don't
                 * have a font that will fit, then it will use the
                 * default builtin font and adjust the rows and columns
                 * to fit on the screen.
                 */
                set_font(&tems.ts_font,
                    &tems.ts_c_dimension.height,
                    &tems.ts_c_dimension.width,
                    tems.ts_p_dimension.height,
                    tems.ts_p_dimension.width);

                tems.ts_p_offset.y = (tems.ts_p_dimension.height -
                    (tems.ts_c_dimension.height * tems.ts_font.height)) / 2;
                tems.ts_p_offset.x = (tems.ts_p_dimension.width -
                    (tems.ts_c_dimension.width * tems.ts_font.width)) / 2;

                tems.ts_pix_data_size =
                    tems.ts_font.width * tems.ts_font.height;

                tems.ts_pix_data_size *= 4;

                tems.ts_pdepth = tp->depth;

                break;
        }

        /* Now virtual cls also uses the blank_line buffer */
        if (tems.ts_blank_line)
                kmem_free(tems.ts_blank_line, old_blank_buf_size);

        tems.ts_blank_line = (unsigned char *)
            kmem_alloc(tems.ts_c_dimension.width, KM_SLEEP);
        for (i = 0; i < tems.ts_c_dimension.width; i++)
                tems.ts_blank_line[i] = ' ';
}

/*
 * This is a callback function that we register with the frame
 * buffer driver layered underneath.  It gets invoked from
 * the underlying frame buffer driver to reconfigure the terminal
 * emulator to a new screen size and depth in conjunction with
 * framebuffer videomode changes.
 * Here we keep the foreground/background color and attributes,
 * which may be different with the initial settings, so that
 * the color won't change while the framebuffer videomode changes.
 * And we also reset the kernel terminal emulator and clear the
 * whole screen.
 */
/* ARGSUSED */
void
tems_modechange_callback(struct vis_modechg_arg *arg,
    struct vis_devinit *devinit)
{
        uchar_t diff;
        struct tem_vt_state *p;
        tem_modechg_cb_t cb;
        tem_modechg_cb_arg_t cb_arg;

        ASSERT(!(list_is_empty(&tems.ts_list)));

        mutex_enter(&tems.ts_lock);

        /*
         * currently only for pixel mode
         */
        diff = tems_check_videomode(devinit);
        if (diff == 0) {
                mutex_exit(&tems.ts_lock);
                return;
        }

        diff = diff & TEMS_DIMENSION_DIFF;

        if (diff == 0) {
                /*
                 * Only need to reinit the active tem.
                 */
                struct tem_vt_state *active = tems.ts_active;
                tems.ts_pdepth = devinit->depth;

                mutex_enter(&active->tvs_lock);
                ASSERT(active->tvs_isactive);
                tem_reinit(active, B_TRUE);
                mutex_exit(&active->tvs_lock);

                mutex_exit(&tems.ts_lock);
                return;
        }

        tems_setup_terminal(devinit, tems.ts_c_dimension.height,
            tems.ts_c_dimension.width);

        for (p = list_head(&tems.ts_list); p != NULL;
            p = list_next(&tems.ts_list, p)) {
                mutex_enter(&p->tvs_lock);
                tem_reinit(p, p->tvs_isactive);
                mutex_exit(&p->tvs_lock);
        }


        if (tems.ts_modechg_cb == NULL) {
                mutex_exit(&tems.ts_lock);
                return;
        }

        cb = tems.ts_modechg_cb;
        cb_arg = tems.ts_modechg_arg;

        /*
         * Release the lock while doing callback.
         */
        mutex_exit(&tems.ts_lock);
        cb(cb_arg);
}

/*
 * This function is used to display a rectangular blit of data
 * of a given size and location via the underlying framebuffer driver.
 * The blit can be as small as a pixel or as large as the screen.
 */
void
tems_display_layered(
        struct vis_consdisplay *pda,
        cred_t *credp)
{
        int rval;

        (void) ldi_ioctl(tems.ts_hdl, VIS_CONSDISPLAY,
            (intptr_t)pda, FKIOCTL, credp, &rval);
}

/*
 * This function is used to invoke a block copy operation in the
 * underlying framebuffer driver.  Rectangle copies are how scrolling
 * is implemented, as well as horizontal text shifting escape seqs.
 * such as from vi when deleting characters and words.
 */
void
tems_copy_layered(
        struct vis_conscopy *pma,
        cred_t *credp)
{
        int rval;

        (void) ldi_ioctl(tems.ts_hdl, VIS_CONSCOPY,
            (intptr_t)pma, FKIOCTL, credp, &rval);
}

/*
 * This function is used to show or hide a rectangluar monochrom
 * pixel inverting, text block cursor via the underlying framebuffer.
 */
void
tems_cursor_layered(
        struct vis_conscursor *pca,
        cred_t *credp)
{
        int rval;

        (void) ldi_ioctl(tems.ts_hdl, VIS_CONSCURSOR,
            (intptr_t)pca, FKIOCTL, credp, &rval);
}

static void
tem_kdsetmode(int mode, cred_t *credp)
{
        int rval;

        (void) ldi_ioctl(tems.ts_hdl, KDSETMODE,
            (intptr_t)mode, FKIOCTL, credp, &rval);

}

static void
tems_reset_colormap(cred_t *credp, enum called_from called_from)
{
        struct vis_cmap cm;
        int rval;

        if (called_from == CALLED_FROM_STANDALONE)
                return;

        switch (tems.ts_pdepth) {
        case 8:
                cm.index = 0;
                cm.count = 16;
                cm.red   = cmap4_to_24.red;   /* 8-bits (1/3 of TrueColor 24) */
                cm.blue  = cmap4_to_24.blue;  /* 8-bits (1/3 of TrueColor 24) */
                cm.green = cmap4_to_24.green; /* 8-bits (1/3 of TrueColor 24) */
                (void) ldi_ioctl(tems.ts_hdl, VIS_PUTCMAP, (intptr_t)&cm,
                    FKIOCTL, credp, &rval);
                break;
        }
}

void
tem_get_size(ushort_t *r, ushort_t *c, ushort_t *x, ushort_t *y)
{
        mutex_enter(&tems.ts_lock);
        *r = (ushort_t)tems.ts_c_dimension.height;
        *c = (ushort_t)tems.ts_c_dimension.width;
        *x = (ushort_t)tems.ts_p_dimension.width;
        *y = (ushort_t)tems.ts_p_dimension.height;
        mutex_exit(&tems.ts_lock);
}

void
tem_register_modechg_cb(tem_modechg_cb_t func, tem_modechg_cb_arg_t arg)
{
        mutex_enter(&tems.ts_lock);

        tems.ts_modechg_cb = func;
        tems.ts_modechg_arg = arg;

        mutex_exit(&tems.ts_lock);
}

/*
 * This function is to scroll up the OBP output, which has
 * different screen height and width with our kernel console.
 */
static void
tem_prom_scroll_up(struct tem_vt_state *tem, int nrows, cred_t *credp,
    enum called_from called_from)
{
        struct vis_conscopy     ma;
        int     ncols, width;

        /* copy */
        ma.s_row = nrows * tems.ts_font.height;
        ma.e_row = tems.ts_p_dimension.height - 1;
        ma.t_row = 0;

        ma.s_col = 0;
        ma.e_col = tems.ts_p_dimension.width - 1;
        ma.t_col = 0;

        tems_safe_copy(&ma, credp, called_from);

        /* clear */
        width = tems.ts_font.width;
        ncols = (tems.ts_p_dimension.width + (width - 1))/ width;

        tem_safe_pix_cls_range(tem, 0, nrows, tems.ts_p_offset.y,
            0, ncols, 0, B_TRUE, credp, called_from);
}

#define PROM_DEFAULT_FONT_HEIGHT        22
#define PROM_DEFAULT_WINDOW_TOP         0x8a

/*
 * This function is to compute the starting row of the console, according to
 * PROM cursor's position. Here we have to take different fonts into account.
 */
static int
tem_adjust_row(struct tem_vt_state *tem, int prom_row, cred_t *credp,
    enum called_from called_from)
{
        int     tem_row;
        int     tem_y;
        int     prom_charheight = 0;
        int     prom_window_top = 0;
        int     scroll_up_lines;

        plat_tem_get_prom_font_size(&prom_charheight, &prom_window_top);
        if (prom_charheight == 0)
                prom_charheight = PROM_DEFAULT_FONT_HEIGHT;
        if (prom_window_top == 0)
                prom_window_top = PROM_DEFAULT_WINDOW_TOP;

        tem_y = (prom_row + 1) * prom_charheight + prom_window_top -
            tems.ts_p_offset.y;
        tem_row = (tem_y + tems.ts_font.height - 1) /
            tems.ts_font.height - 1;

        if (tem_row < 0) {
                tem_row = 0;
        } else if (tem_row >= (tems.ts_c_dimension.height - 1)) {
                /*
                 * Scroll up the prom outputs if the PROM cursor's position is
                 * below our tem's lower boundary.
                 */
                scroll_up_lines = tem_row -
                    (tems.ts_c_dimension.height - 1);
                tem_prom_scroll_up(tem, scroll_up_lines, credp, called_from);
                tem_row = tems.ts_c_dimension.height - 1;
        }

        return (tem_row);
}

void
tem_pix_align(struct tem_vt_state *tem, cred_t *credp,
    enum called_from called_from)
{
        uint32_t row = 0;
        uint32_t col = 0;

        if (plat_stdout_is_framebuffer()) {
                plat_tem_hide_prom_cursor();

                /*
                 * We are getting the current cursor position in pixel
                 * mode so that we don't over-write the console output
                 * during boot.
                 */
                plat_tem_get_prom_pos(&row, &col);

                /*
                 * Adjust the row if necessary when the font of our
                 * kernel console tem is different with that of prom
                 * tem.
                 */
                row = tem_adjust_row(tem, row, credp, called_from);

                /* first line of our kernel console output */
                tem->tvs_first_line = row + 1;

                /* re-set and align cusror position */
                tem->tvs_s_cursor.row = tem->tvs_c_cursor.row =
                    (screen_pos_t)row;
                tem->tvs_s_cursor.col = tem->tvs_c_cursor.col = 0;
        } else {
                tem_safe_reset_display(tem, credp, called_from, B_TRUE, B_TRUE);
        }
}

static void
tems_get_inverses(boolean_t *p_inverse, boolean_t *p_inverse_screen)
{
        int i_inverse = 0;
        int i_inverse_screen = 0;

        plat_tem_get_inverses(&i_inverse, &i_inverse_screen);

        *p_inverse = (i_inverse == 0) ? B_FALSE : B_TRUE;
        *p_inverse_screen = (i_inverse_screen == 0) ? B_FALSE : B_TRUE;
}

/*
 * Get the foreground/background color and attributes from the initial
 * PROM, so that our kernel console can keep the same visual behaviour.
 */
static void
tems_get_initial_color(tem_color_t *pcolor)
{
        boolean_t inverse, inverse_screen;
        unsigned short  flags = 0;

        pcolor->fg_color = DEFAULT_ANSI_FOREGROUND;
        pcolor->bg_color = DEFAULT_ANSI_BACKGROUND;

        if (plat_stdout_is_framebuffer()) {
                tems_get_inverses(&inverse, &inverse_screen);
                if (inverse)
                        flags |= TEM_ATTR_REVERSE;
                if (inverse_screen)
                        flags |= TEM_ATTR_SCREEN_REVERSE;

                if (flags != 0) {
                        /*
                         * If either reverse flag is set, the screen is in
                         * white-on-black mode.  We set the bold flag to
                         * improve readability.
                         */
                        flags |= TEM_ATTR_BOLD;
                } else {
                        /*
                         * Otherwise, the screen is in black-on-white mode.
                         * The SPARC PROM console, which starts in this mode,
                         * uses the bright white background colour so we
                         * match it here.
                         */
                        if (pcolor->bg_color == ANSI_COLOR_WHITE)
                                flags |= TEM_ATTR_BRIGHT_BG;
                }
        }

        pcolor->a_flags = flags;
}

uchar_t
tem_get_fbmode(tem_vt_state_t tem_arg)
{
        struct tem_vt_state *tem = (struct tem_vt_state *)tem_arg;

        uchar_t fbmode;

        mutex_enter(&tem->tvs_lock);
        fbmode = tem->tvs_fbmode;
        mutex_exit(&tem->tvs_lock);

        return (fbmode);
}

void
tem_set_fbmode(tem_vt_state_t tem_arg, uchar_t fbmode, cred_t *credp)
{
        struct tem_vt_state *tem = (struct tem_vt_state *)tem_arg;

        mutex_enter(&tems.ts_lock);
        mutex_enter(&tem->tvs_lock);

        if (fbmode == tem->tvs_fbmode) {
                mutex_exit(&tem->tvs_lock);
                mutex_exit(&tems.ts_lock);
                return;
        }

        tem->tvs_fbmode = fbmode;

        if (tem->tvs_isactive) {
                tem_kdsetmode(tem->tvs_fbmode, credp);
                if (fbmode == KD_TEXT)
                        tem_safe_unblank_screen(tem, credp, CALLED_FROM_NORMAL);
        }

        mutex_exit(&tem->tvs_lock);
        mutex_exit(&tems.ts_lock);
}

void
tem_activate(tem_vt_state_t tem_arg, boolean_t unblank, cred_t *credp)
{
        struct tem_vt_state *tem = (struct tem_vt_state *)tem_arg;

        mutex_enter(&tems.ts_lock);
        tems.ts_active = tem;

        mutex_enter(&tem->tvs_lock);
        tem->tvs_isactive = B_TRUE;

        tem_kdsetmode(tem->tvs_fbmode, credp);

        if (unblank)
                tem_safe_unblank_screen(tem, credp, CALLED_FROM_NORMAL);

        mutex_exit(&tem->tvs_lock);
        mutex_exit(&tems.ts_lock);
}

void
tem_switch(tem_vt_state_t tem_arg1, tem_vt_state_t tem_arg2, cred_t *credp)
{
        struct tem_vt_state *cur = (struct tem_vt_state *)tem_arg1;
        struct tem_vt_state *tobe = (struct tem_vt_state *)tem_arg2;

        mutex_enter(&tems.ts_lock);
        mutex_enter(&tobe->tvs_lock);
        mutex_enter(&cur->tvs_lock);

        tems.ts_active = tobe;
        cur->tvs_isactive = B_FALSE;
        tobe->tvs_isactive = B_TRUE;

        mutex_exit(&cur->tvs_lock);

        if (cur->tvs_fbmode != tobe->tvs_fbmode)
                tem_kdsetmode(tobe->tvs_fbmode, credp);

        if (tobe->tvs_fbmode == KD_TEXT)
                tem_safe_unblank_screen(tobe, credp, CALLED_FROM_NORMAL);

        mutex_exit(&tobe->tvs_lock);
        mutex_exit(&tems.ts_lock);
}