cfdbb712fb
Now that the SystemMonitor queries which open files can be read and written to, having can_read()/can_write() unconditionally call ASSERT_NOT_REACHED() leads to system crashes when inspecting the WindowServer. Instead, just return true from can_read()/can_write() (indicating that the read()/write() syscalls should not block) and return -EINVAL when trying to actually read from or write to these devices.
31 lines
1.2 KiB
C++
31 lines
1.2 KiB
C++
#pragma once
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/VM/PhysicalAddress.h>
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class MBVGADevice final : public BlockDevice {
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AK_MAKE_ETERNAL
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public:
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static MBVGADevice& the();
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MBVGADevice(PhysicalAddress addr, int pitch, int width, int height);
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virtual int ioctl(FileDescription&, unsigned request, unsigned arg) override;
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virtual KResultOr<Region*> mmap(Process&, FileDescription&, VirtualAddress preferred_vaddr, size_t offset, size_t, int prot) override;
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private:
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virtual const char* class_name() const override { return "MBVGA"; }
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virtual bool can_read(const FileDescription&) const override { return true; }
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virtual bool can_write(const FileDescription&) const override { return true; }
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virtual ssize_t read(FileDescription&, u8*, ssize_t) override { return -EINVAL; }
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virtual ssize_t write(FileDescription&, const u8*, ssize_t) override { return -EINVAL; }
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size_t framebuffer_size_in_bytes() const { return m_framebuffer_pitch * m_framebuffer_height; }
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PhysicalAddress m_framebuffer_address;
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int m_framebuffer_pitch { 0 };
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int m_framebuffer_width { 0 };
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int m_framebuffer_height { 0 };
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};
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