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feat(v4.0.0): the block words are the kernel's -- v3's way in full

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Ruled 2026-10-07.  BLOCK, BUFFER, UPDATE, SAVE-BUFFERS and EMPTY-BUFFERS
are each one kernel request on port 0, by block number only.  The node
has a window of four slots in its memory, as a v3 VM has; the kernel
copies blocks into it, keeps the record of which block is in which slot,
and decides when a block is written (v4/system/blocks.c).  The node keeps
no record and gives the kernel no address, so a request cannot overwrite
the node's code.  When a block is written stays FORTH-79's: UPDATE marks
it.  When the chain of devices changes the slots are let go, as in v3.

The window is 512 cells more than the two buffers were; the dictionary
space ends that much lower, at 13824.

MESH.md 8.5 had said, from the review, that a v3 VM's BLOCK is the
kernel's buffer.  It is not, and the section now says what was reported,
what v3 does, and what was ruled.

make -C v4 test, sanitize and hosted-check pass; amd64, aarch64 and
riscv64 boot, POST 538 of 538, the same hashes on all six:
logs/20261007-092835, -093112, -093456.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-07 09:37:30 -04:00
co-authored by Claude Opus 5.5
parent 7f4d946d2e
commit 9bfd5071d2
21 changed files with 991 additions and 330 deletions
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v4/Makefile
+3 -3
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@@ -51,15 +51,15 @@ node_size = $(if $(findstring /test_host_,$(1)),-DV4_NODE_WORDS=$(HOST_WORDS) -D
# BLOCKS (docs/v4.0.0/MESH.md section 8). A node asks its kernel for a
# block, and system/blocks.c serves it from the kernel's block subsystem,
# which is v3's and is built as v3 builds it. Tests named test_blocks*.c
# and test_host_*.c link them. V3_BLOCK_SRCS is all of v3 that the block
# which is v3's and is built as v3 builds it. Tests named
# test_host_*.c link them. V3_BLOCK_SRCS is all of v3 that the block
# subsystem needs: its two device back ends, the log and the clock.
ROOT_DIR := $(abspath $(HERE)/..)
V3_BLOCK_SRCS := $(addprefix $(ROOT_DIR)/v3/src/,block_subsystem.c blkio_ram.c blkio_file.c log.c platform/platform_init.c platform/linux/time.c)
V3_CFLAGS := -std=gnu99 -Wall $(OPT) -I$(ROOT_DIR)/v3/include -I$(ROOT_DIR)/kernel/include
BLOCKS_SRC := $(HERE)/system/blocks.c
V3_INC := -isystem $(ROOT_DIR)/v3/include -isystem $(ROOT_DIR)/kernel/include
uses_blocks = $(or $(findstring /test_blocks,$(1)),$(findstring /test_host_,$(1)))
uses_blocks = $(findstring /test_host_,$(1))
blocks_inc = $(if $(call uses_blocks,$(1)),$(V3_INC))
$(BINDIR)/v3blocks.o: $(V3_BLOCK_SRCS) $(wildcard $(ROOT_DIR)/v3/include/*.h) $(HERE)/Makefile