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riscv: enable EFI framebuffer

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Pass framebuffer information from loader(8) to the kernel via the
MODINFOMD_EFI_FB metadata field.

Enable the vt_efifb driver. A small tweak is required to work around the
lack of VM_MEMATTR_WRITE_COMBINING on this platform; we use
VM_MEMATTR_UNCACHEABLE instead.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D48884
This commit is contained in:
Mitchell Horne 2025-03-03 11:46:39 -04:00
parent a2e2178402
commit e2a08ac9ce
4 changed files with 10 additions and 3 deletions
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2
stand/efi/loader/bootinfo.c
View file

@ -182,7 +182,7 @@ bi_load_efi_data(struct preloaded_file *kfp, bool exit_bs)
struct efi_map_header *efihdr;
bool do_vmap;
#if defined(__amd64__) || defined(__aarch64__) || defined(__i386__)
#ifdef MODINFOMD_EFI_FB
struct efi_fb efifb;
efifb.fb_addr = gfx_state.tg_fb.fb_addr;

9
sys/dev/vt/hw/efifb/efifb.c
View file

@ -96,9 +96,11 @@ vt_efifb_init(struct vt_device *vd)
{
struct fb_info *info;
struct efi_fb *efifb;
int memattr;
vm_memattr_t memattr;
int roff, goff, boff;
char attr[16];
#ifdef VM_MEMATTR_WRITE_COMBINING
char attr[16];
/*
* XXX TODO: I think there's more nuance here than we're acknowledging,
@ -122,6 +124,9 @@ vt_efifb_init(struct vt_device *vd)
memattr = VM_MEMATTR_UNCACHEABLE;
}
}
#else
memattr = VM_MEMATTR_UNCACHEABLE;
#endif
info = vd->vd_softc;
if (info == NULL)

1
sys/riscv/conf/GENERIC
View file

@ -140,6 +140,7 @@ device uart_ns8250 # ns8250-type UART driver
# Console
device vt
device vt_efifb
device kbdmux
# RTC

1
sys/riscv/include/metadata.h
View file

@ -30,6 +30,7 @@
#define MODINFOMD_DTBP 0x1001
#define MODINFOMD_EFI_MAP 0x1002
#define MODINFOMD_EFI_FB 0x1003
struct efi_map_header {
size_t memory_size;