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A little more progress toward the implementation of per-window framebuffers. Still missing:

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- Logic that generates the low lever framebuffer renderers for the per-window framebuffers,
- The logic that picks off the per-window framebuffer updates from normal graphics device updates.  This logic must update both the per-window framebuffer and the graphics device (from the framebuffer).

Squashed commit of the following:

    graphics:  Add logic to allocate the per-window framebuffer.

    graphics:  A few fragmentary thoughts on how a per-window framebuffer could be represented and allocated.
This commit is contained in:
Gregory Nutt
2019-03-14 11:20:14 -06:00
parent 2f257cfd0a
commit 419c4cb6be
7 changed files with 216 additions and 32 deletions
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include/sys/mman.h
+27 -21
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@@ -1,7 +1,8 @@
/****************************************************************************
* include/sys/mman.h
*
* Copyright (C) 2008, 2009, 2011, 2014 Gregory Nutt. All rights reserved.
* Copyright (C) 2008, 2009, 2011, 2014, 2019 Gregory Nutt. All rights
* reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -51,30 +52,35 @@
* yet support any of these, but are provided for source level compatibility
*/
#define PROT_NONE 0x0 /* Page may not be accessed */
#define PROT_READ 0x1 /* Page may be read */
#define PROT_WRITE 0x2 /* Page may be written */
#define PROT_EXEC 0x4 /* Page may be executed */
#define PROT_NONE 0x0 /* Page may not be accessed */
#define PROT_READ (1 << 0) /* Bit 0: Page may be read */
#define PROT_WRITE (1 << 1) /* Bit 1: Page may be written */
#define PROT_EXEC (1 << 2) /* Bit 2: Page may be executed */
/* Sharing types -- ignored by NuttX. */
/* mmpa() flags bits. Only MAP_SHARED, MAP_PRIVATE, and MAP_FIXED are
* specified by OpenGroup.org. The rest are unique to NuttX or are
* definitions used by other systems.
*/
#define MAP_SHARED 0x00001 /* Share this mapping */
#define MAP_PRIVATE 0x00002 /* Create a private copy-on-write mapping */
#define MAP_TYPE 0x0000f /* Mask for type of mapping */
#define MAP_FIXED 0x00010 /* Map to specified address exactly */
#define MAP_FILE 0x00000 /* The mapping is backed by a file */
#define MAP_ANONYMOUS 0x00020 /* The mapping is not backed by any file */
#define MAP_ANON MAP_ANONYMOUS
/* Sharing types (most are not implemented). */
/* These are Linux-specific. */
#define MAP_SHARED (1 << 0) /* Bit 0: Share this mapping */
#define MAP_PRIVATE (1 << 1) /* Bit 1: Create a private copy-on-write mapping */
#define MAP_TYPE (3 << 0) /* Mask for type of mapping */
#define MAP_FIXED (1 << 2) /* Bit 2: Map to specified address exactly */
#define MAP_FILE (1 << 3) /* Bit 3: The mapping is backed by a file */
#define MAP_ANONYMOUS (1 << 4) /* Bit 4: The mapping is not backed by any file */
#define MAP_ANON MAP_ANONYMOUS /* Alias */
#define MAP_GROWSDOWN 0x00100 /* Used to stack allocations */
#define MAP_DENYWRITE 0x00800 /* Do not permit writes to file */
#define MAP_EXECUTABLE 0x01000 /* Mark it as an executable */
#define MAP_LOCKED 0x02000 /* Lock pages mapped into memory */
#define MAP_NORESERVE 0x04000 /* Do not reserve swap space for this mapping */
#define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* Do not block on IO */
/* These are Linux-specific (none are implemented). */
#define MAP_GROWSDOWN (1 << 5) /* Bit 5: Used to stack allocations */
#define MAP_DENYWRITE (1 << 6) /* Bit 6: Do not permit writes to file */
#define MAP_EXECUTABLE (1 << 7) /* Bit 7: Mark it as an executable */
#define MAP_LOCKED (1 << 8) /* Bit 8: Lock pages mapped into memory */
#define MAP_NORESERVE (1 << 9) /* Bit 9: Do not reserve swap space for this mapping */
#define MAP_POPULATE (1 << 10) /* Bit 10: opulate (prefault) page tables */
#define MAP_NONBLOCK (1 << 11) /* Bit 11: Do not block on IO */
/* Failure return */