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hwreport: describe a machine onto a USB stick, from a Linux-style /sys

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hwreport writes one folder to the first read-write FAT mount, or mounts
the first USB stick that takes vfat itself and unmounts it afterwards:
summary.txt (machine, firmware, CPU, memory, every PCI and USB device
with its driver or "-- no driver"), dmesg.txt, lspci.txt in the shape of
lspci -nnk -xxx, lsusb.txt, dmi.txt, memmap.txt, the ACPI tables as raw
.dat files iasl -d reads, and copies of /proc. Serials, the UUID and the
MSDM/SLIC tables (a Windows licence key) are left out.

It reads /sys, which is new: sysfs at Linux's paths and in Linux's
formats -- /sys/bus/pci/devices with uevent, config and resource,
/sys/bus/usb/devices, /sys/firmware/acpi/tables, dmi/tables, memmap
and efi, /sys/class/dmi/id. toybox's lspci and lsusb work unmodified
against it. The USB core now keeps a table of attached devices for it.

The machine's name comes from SMBIOS (kernel/dev/dmi.c). The UEFI loader
hands over the entry point from the configuration table, the kernel
falls back to the 0xF0000 scan, and the log gets Linux's "DMI:" line.

Two bugs found on the way:

- The loader handed over at most 40 memory-map entries, in firmware
  order. A laptop's UEFI map is 60-150 descriptors with RAM above 4 GB
  listed last, so that is what was dropped. The entries now have their
  own area at 0x31000 with room for 256, are sorted before merging, and
  the kernel's 32 usable regions keep the largest when there are more.
- MemTotal and sysinfo's totalram were PHYSTOP, an address, which counts
  the PCI hole: a 6 GB machine reported 8. Now the usable RAM, summed.

usb.ids moves to /usr/share/hwdata, where lsusb looks for it, and
pci.ids joins it (`make pci-ids`, BSD-3-Clause like usb.ids).

Checked under QEMU q35: the report written to a FAT32 stick, fsck.fat
clean, DSDT.dat disassembled by iasl on the host, lspci -k and lsusb
showing names, 6 GB of RAM seen as 6137 MB.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-23 12:54:11 +02:00
commit eab13241a0
25 changed files with 2520 additions and 65 deletions
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9
kernel/sys/sys_proc.c
View file

@ -2,6 +2,7 @@
#include "defs.h"
#include "param.h"
#include "memlayout.h"
#include "hwinfo.h"
#include "mmu.h"
#include "proc.h"
#include "x86.h"
@ -505,10 +506,10 @@ addr_t sys_sysinfo(void)
uint64 upsec, upusec;
monotonic(&upsec, &upusec);
si->uptime = (long)upsec;
// Real values: PHYSTOP is the top of usable physical memory and the page
// allocator knows exactly how much of it is still on the free list. These
// used to be the constants 256MB/128MB, invented and always wrong.
si->totalram = (uint64)PHYSTOP;
// Real values: the RAM the page allocator was given, and how much of it is
// still on the free list. These used to be the constants 256MB/128MB, and
// then PHYSTOP, an address, which counted the PCI hole as memory.
si->totalram = ram_total_bytes();
si->freeram = kalloc_free_bytes();
si->mem_unit = 1;
si->procs = (uint16)proc_num();