[PATCH 00/35] global_data: Reduce size of struct global_data

[Simon Glass]

The global data structure has grown quite a lot over the years, being
the best place to put an important pointer or something that must be
accessed before and after relocation.

This series attempts to reduce the size a little, by moving some things
out and shrinking and aligning some fields.

Some fields are needed during init but not afterwards. To deal with this
a new 'boardf' structure is created, which sits on the stack and is only
present during board_init_f(). It is possible that more fields could
move to this struct, but for now only 4 are moved.

An assumption is made that an int is 32-bits wide on all architectures,
which seems to be true, but maintainers should be able to confirm.

Mostly the code-size impact is neutral, but the patch
'Use less space for environment fields' does increase U-Boot's size by
about 30 bytes on aarch64.

For firefly-rk3399 (64-bit) the size of global reduces from 456 to 368
bytes. For SPL it reduces from 416 to 272 bytes.

There are other things which could be attempted, for example:
- Using hlist instead of list for some lists
- Checking that only necessary fields are present in SPL


Simon Glass (35):
  global_data: Move pci_clk to m68k and powerpc
  x86: Drop use of global_data fb_base
  video: Add a function to obtain the framebuffer address
  video: mxc: Avoid setting global_data fb_base
  video: mxs: Avoid setting global_data fb_base
  arm: friendlyarm: Avoid accessing global_data fb_base
  arm: ronetix: Avoid accessing global_data fb_base
  zynqmp: Avoid setting the framebuffer address
  video: Avoid setting global_data fb_base from SPL handoff
  video: Avoid setting global_data fb_base in video setup
  global_data: Drop fb_base
  global_data: Convert have_console into a flag
  global_data: Remove pci_ram_top
  global_data: Drop global_data hose
  global_data: Drop pci_bootdelay
  global_data: Use less space for environment fields
  board_f: Add a new struct to hold pre-relocation info
  board_f: Move fdt_size to board
  board_f: Move new_bootstage to boardf
  board_f: Move new_bloblist to boardf
  global_data: Drop spl_handoff
  global_data: Collect common fields at the top
  global_data: Reduce the size of bus_clk and mem_clk
  global_data: Reduce the size of mon_len
  global_data: log: Reorder and shrink fields
  global_data: Reduce size of early-malloc vars
  global_data: Move baud_rate field lower
  global_data: Move env_addr field higher
  global_data: Put phys_addr fields near the top
  global_data: Move ulong fields together
  global_data: Move pointer members together
  global_data: Remove jump table in SPL
  global_data: Remove environment members if not used
  doc: Move generic-board documentation into rst
  doc: Add some guidelines about global data

 arch/arm/cpu/arm926ejs/mxs/spl_boot.c         |   2 +-
 arch/arm/lib/bdinfo.c                         |   2 +-
 arch/arm/mach-exynos/spl_boot.c               |   2 +-
 arch/arm/mach-k3/common.c                     |   2 +-
 arch/arm/mach-k3/r5/sysfw-loader.c            |   2 +-
 arch/arm/mach-tegra/board2.c                  |   4 -
 arch/arm/mach-tegra/cboot.c                   |   4 -
 arch/m68k/cpu/mcf5445x/cpu.c                  |   2 +-
 arch/m68k/include/asm/global_data.h           |   2 +
 arch/m68k/lib/bdinfo.c                        |   2 +-
 arch/mips/mach-ath79/ar934x/clk.c             |   4 +-
 arch/mips/mach-octeon/cpu.c                   |   2 +-
 arch/powerpc/cpu/mpc83xx/pci.c                |   4 +-
 arch/powerpc/cpu/mpc83xx/speed.c              |   2 +-
 arch/powerpc/include/asm/global_data.h        |   2 +
 arch/x86/cpu/i386/cpu.c                       |   8 -
 arch/x86/cpu/intel_common/cpu_from_spl.c      |   4 +-
 arch/x86/cpu/ivybridge/cpu.c                  |   5 -
 arch/x86/lib/fsp/fsp_graphics.c               |   1 -
 arch/x86/lib/fsp2/fsp_dram.c                  |   4 +-
 board/freescale/ls2080ardb/eth_ls2080rdb.c    |   2 +-
 board/friendlyarm/nanopi2/board.c             |   9 +-
 board/ronetix/pm9263/pm9263.c                 |   6 +-
 board/siemens/common/board_am335x.c           |   2 +-
 cmd/bdinfo.c                                  |   2 -
 cmd/sb.c                                      |   6 +-
 common/board_f.c                              |  59 ++-
 common/board_r.c                              |   2 +-
 common/console.c                              |  17 +-
 common/hwconfig.c                             |   8 +-
 common/init/handoff.c                         |  12 +
 common/malloc_simple.c                        |   7 +-
 common/spl/spl.c                              |   6 +-
 doc/develop/global_data.rst                   |  25 ++
 .../historical/generic_board.rst}             |  16 +-
 doc/develop/historical/index.rst              |  12 +
 doc/develop/index.rst                         |   8 +
 drivers/clk/mpc83xx_clk.c                     |   2 +-
 drivers/clk/rockchip/clk_rk3399.c             |   3 +-
 drivers/video/imx/mxc_ipuv3_fb.c              |   2 -
 drivers/video/mxsfb.c                         |   1 -
 drivers/video/video-uclass.c                  |  16 +-
 drivers/video/zynqmp/zynqmp_dpsub.c           |   3 +-
 include/asm-generic/global_data.h             | 349 ++++++++----------
 include/board_f.h                             |  35 ++
 include/env_default.h                         |   3 -
 include/env_internal.h                        |   1 +
 include/handoff.h                             |   7 +
 include/video.h                               |  11 +
 lib/asm-offsets.c                             |   2 +
 test/cmd/bdinfo.c                             |   3 -
 test/log/log_test.c                           |   6 +-
 52 files changed, 373 insertions(+), 330 deletions(-)
 rename doc/{README.generic-board => develop/historical/generic_board.rst} (96%)
 create mode 100644 doc/develop/historical/index.rst
 create mode 100644 include/board_f.h

-- 
2.34.1