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storage: NVMe, so a laptop's SSD is a disk SchOS can boot from

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A native driver written from the NVMe 1.4 base specification. It resets
the controller the firmware left running, then sets up an admin queue and
one I/O queue pair. Completion is polled, with interrupts disabled at the
queue, for the same reason AHCI polls: without AML, interrupt routing on
real hardware cannot be trusted. Each active namespace with 512-byte to
4 KB sectors and no metadata is registered as nvme<C>n<N>, the name
Linux uses, and its GPT is read like any other disk's.

Tested under QEMU q35: disk.img on NVMe as the only disk boots through
OVMF, roots on nvme0n1p2, and writes read back after sync. A
4 KB-sector namespace registers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-22 15:48:11 +02:00
commit efb6446f47
5 changed files with 484 additions and 8 deletions
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2
kernel/drivers/registry.c
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@ -36,6 +36,7 @@ extern const struct pci_driver ac97_driver;
extern const struct pci_driver r8169_driver;
extern const struct pci_driver rtl8139_driver;
extern const struct pci_driver ahci_driver;
extern const struct pci_driver nvme_driver;
// Order matters here in one respect: virtio-gpu is offered the bus before the
// VBE framebuffer driver, so that on a machine with both, the device with real
@ -50,6 +51,7 @@ static const struct pci_driver *drivers[] = {
&rtl8139_driver,
&xhci_driver,
&ahci_driver,
&nvme_driver,
&ac97_driver,
};